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iPhone XS iPhone XS - momentary stuttering after inactivity

justinhill

justinhill

macrumors member
Original poster
Sep 8, 2016
57
85
Bay Area
I've noticed on my iPhone XS that if I am scrolling through something, say a webpage in Safari, when I lift my finger for around 10 seconds to read something, my phone stutters for a hundred milliseconds or so when I start scrolling again. Seems small, but it's very distracting, and the 6s I'm coming from doesn't do this. Had anyone else noticed this issue?

My current theory is Apple's performance controller is aggressively throttling on idle to save battery. Really hoping this isn't intended behavior.
 
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Yes, mine stutters too plus I am having calls fail and have to reset network settings to get it to work right. I am hoping it is just my phone as I am going to try to swap out this week.
 
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Happened to me with Xs Max.

Also think that it is throttling to save battery. But I thought that it was because reading on larger screen takes longer (there is more text on screen) and treshold for idle throttling is exceeded. Came to that conclusion because it did not occur on my iPhone X.
 
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exgymnast said:
Yes, mine stutters too plus I am having calls fail and have to reset network settings to get it to work right. I am hoping it is just my phone as I am going to try to swap out this week.
Click to expand...

Have a look at the burgeoning reception thread. If I were you, I'd be returning it.
 
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It seems that the stutter isn’t limited to scrolling. If I open an app, let it sit for 10 seconds, then swipe home, the minimize animation stutters. Seems to be more noticeable when apps are located at the bottom of your home screen.
 
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DDustiNN said:
It seems that the stutter isn’t limited to scrolling. If I open an app, let it sit for 10 seconds, then swipe home, the minimize animation stutters. Seems to be more noticeable when apps are located at the bottom of your home screen.
Click to expand...

I also noticed this after I started the thread.
 
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I have this exact same issue. Very visible on apps such as Instagram and Snapchat. Also happens if you scroll back and forth, by lifting your thumb (not on Safari though). Do you guys believe its reason to return our devices or rather that this is software, and others have not yet noticed this (took me about two days)? Very disturbing.
 
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Zdodo said:
I have this exact same issue. Very visible on apps such as Instagram and Snapchat. Also happens if you scroll back and forth, by lifting your thumb (not on Safari though). Do you guys believe its reason to return our devices or rather that this is software, and others have not yet noticed this (took me about two days)? Very disturbing.
Click to expand...

I have been going through some steps with Apple support to see if the issue can be resolved without returning the phone. I didn't have time last night to complete all the things they recommended, but they were essentially 'did you try hard restarting it, let's try re-flashing iOS, let's try re-restoring from your iCloud backup after you've re-flashed'. Things I don't think will actually resolve the issue, but are the type of hoops they typically have you jump through before offering you a solution that costs them money.

I'll make sure to report back if/when I reach a resolution with support.

Edit: Also, fwiw, my brother doesn't seem to be having this issue with his XS, so it's entirely possible that it's a hardware problem.
 
Where did all of your phones originate from? (if you pre-ordered). Also what models and colours?

Might be interesting to see if they all came from the same factory.

I have a 256GB XS in Space Grey and can't say I've noticed this issue.
 
justinhill said:
I have been going through some steps with Apple support to see if the issue can be resolved without returning the phone. I didn't have time last night to complete all the things they recommended, but they were essentially 'did you try hard restarting it, let's try re-flashing iOS, let's try re-restoring from your iCloud backup after you've re-flashed'. Things I don't think will actually resolve the issue, but are the type of hoops they typically have you jump through before offering you a solution that costs them money.

I'll make sure to report back if/when I reach a resolution with support.

Edit: Also, fwiw, my brother doesn't seem to be having this issue with his XS, so it's entirely possible that it's a hardware problem.
Click to expand...

Thanks, that would be highly appreciated. For what it’s worth, I went to the store earlier today, and checked whether this was happening on the display models (1 XS Max and 2 XS’s). It did on all three.
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mcmanus7 said:
Where did all of your phones originate from? (if you pre-ordered). Also what models and colours?

Might be interesting to see if they all came from the same factory.

I have a 256GB XS in Space Grey and can't say I've noticed this issue.
Click to expand...

I live in Finland, bought it from a local BestBuy equivalent. Space Gray 64gb.
 
256 silver XS from U.S.

Still doing it today.

Currently typing this from my old iPhone X, which does not stutter the slightest bit.
 
Getting this as well. Letting an app sit idle for 10-15 seconds then swiping it away is a pretty sure way to replicate the issue.

I too believe it’s either throttling for better battery, or the lower power cores need some optimization.
 
FWIW I couldn’t replicate this on any of the display XS’s or XS Max’s that I looked at today. Hopefully a bug Apple will sort out.
 
MOTiiVHATE` said:
FWIW I couldn’t replicate this on any of the display XS’s or XS Max’s that I looked at today. Hopefully a bug Apple will sort out.
Click to expand...
Really? That’s interesting. I can replicate it with 100% consistency. Open app, don’t touch the screen for 10 seconds, then scroll or swipe home. Display models weren’t stuttering at all when doing that?
 
DDustiNN said:
Really? That’s interesting. I can replicate it with 100% consistency. Open app, don’t touch the screen for 10 seconds, then scroll or swipe home. Display models weren’t stuttering at all when doing that?
Click to expand...
I can replicate it on my XS but not on any of the four of the display models I checked.

I’m pretty sure it has to do with the cpu throttling. I tried to replicate the issue while recording the screen to add to my bug report but it wouldn’t lag.
 
MOTiiVHATE` said:
I can replicate it on my XS but not on any of the four of the display models I checked.

I’m pretty sure it has to do with the cpu throttling. I tried to replicate the issue while recording the screen to add to my bug report but it wouldn’t lag.
Click to expand...

I had the same experience recording. That’s what initially led me to believe the problem was caused by throttling. I was able to repro it on the display phones at Apple yesterday. Essentially what they told me is to hope that 12.1 fixes the issue. So far it does not. I installed the beta. No improvement.
 
justinhill said:
I had the same experience recording. That’s what initially led me to believe the problem was caused by throttling. I was able to repro it on the display phones at Apple yesterday. Essentially what they told me is to hope that 12.1 fixes the issue. So far it does not. I installed the beta. No improvement.
Click to expand...

I installed the beta as well hoping it was already fixed. Should see beta 2 early next week so we’ll see.
 
If it’s not fixed next week, I’m returning it and sticking to my X. $1,000 for an upgrade shouldn’t be giving me a lesser performance. The camera and speakers sure are nice, but I was never once dissatisfied with my X.
 
DDustiNN said:
If it’s not fixed next week, I’m returning it and sticking to my X. $1,000 for an upgrade shouldn’t be giving me a lesser performance. The camera and speakers sure are nice, but I was never once dissatisfied with my X.
Click to expand...

That’s my plan as well. The stuttering isn’t the end of the world but it’s pretty frustrating considering my X feels like the better phone.
 
Hello,

I have the same issue on my Iphone XS (bought in France).
This is very noticeable after app idle for 10-15 seconds then swiping it away.
I went this morning to an Apple reseller and I could not see this issue on the 3 iPhone XS and XS Max that I tested (I repeated it several times to be 100% sure).
Therefore, it seems that the issue occurs on some XS/XS Max but not on other. Very strange.
I am not sure that Apple will fix it in the future if only few devices are impacted.

Do you have update on your side ?

Thanks
 
DDustiNN said:
Really? That’s interesting. I can replicate it with 100% consistency. Open app, don’t touch the screen for 10 seconds, then scroll or swipe home. Display models weren’t stuttering at all when doing that?
Click to expand...

tried 5 times and my max doesnt do it
 
cant duplicate this with any app. safari, chase, words with friends, iMessage. all smooth for me.
 
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