iPhone 6 high cpu usage

Discussion in 'iPhone' started by metalsoul192, Feb 7, 2015.

  1. metalsoul192 macrumors newbie

    Joined:
    Jan 16, 2015
    #1
    Hello. I have an iPhone 6 with ios 8.1.3. It works just fine, but from time to time the cpu usage rises to 50-60% (according to sysstats lite) even without any app running, and the battery begins to drain really fast. I tried to restore it as a new phone and used it without any single app installed but it didn't work. I have almost everything disabled (bluetooth, location, background refreshing apps). Turning off the screen and waiting for a few minutes seems to fix it temporally, but it's really annoying having to do that everytime that the phone starts to get hot.

    I hope you guys can help to solve that
    Thanks
     
  2. MacLappy macrumors regular

    Joined:
    Jul 28, 2011
    Location:
    Singapore
    #2
    Had the same problem on an iPhone 6 plus, brought it in for apple to service. They said something about bad firmware and replaced it for me.
     
  3. Audban macrumors newbie

    Joined:
    Feb 4, 2015
    #3
    This is quite an annoying experience. Something you would never expect from a company such as Apple. Good thing they have good customer service though.
     
  4. XTheLancerX, Feb 8, 2015
    Last edited: Feb 8, 2015

    XTheLancerX macrumors 68000

    XTheLancerX

    Joined:
    Aug 20, 2014
    Location:
    NY, USA
    #4
    I wonder if this is my issue... Since I first got my iPhone 6 it has been terrible on battery even though I hardly do anything intensive. Software updates have helped, but it's still impossible to get any more than 6 hours on battery. All I do is check social media and use Safari, not that heavy of usage. Brightness is usually at 25% or less and the thing gets warm and drains anyway. I've restored as new 3 times and it has never gotten better. All intensive settings are turned off. What's the best app to check CPU usage?

    Oh actually I want to correct something, it's great on battery up until about 70%. Then it starts getting hot and it drains at 10% per half hour or 45 minutes rather than 10% per hour. I can get 2 hours 45 minutes of usage at 70% but then to get from 70% to 50% it takes less than an hour, making it about 3 hours 30 minutes of usage at 50%. This quickly turns what looks like a 9-10 hour cycle to a 7 hour cycle. Past that point it continues to drain about 10% per half hour, so 4 hours at 40%, 4 hours 30 minutes at 30%, 5 hours at 20%, 5 hours 30 minutes at 10%, and usually by the time it dies, it just reaches 6 hours.

    Have either of you noticed accelerating drain with your iPhone?
     
  5. metalsoul192 thread starter macrumors newbie

    Joined:
    Jan 16, 2015
    #5
    I used sysstats lite to check CPU usage.
     
  6. metalsoul192 thread starter macrumors newbie

    Joined:
    Jan 16, 2015
    #7
    I sent it to Apple and they replaced it for me, but the new one have the same behavior :( . I'm starting to think that it's a ios 8 bug or something like that.
     
  7. dictoresno macrumors 601

    dictoresno

    Joined:
    Apr 30, 2012
    Location:
    NJ
    #8
    pretty much what i deal with. i cant really get more than 5.5-6.5 hours of use out of my battery. starts out ok, but simple tasks start tanking the battery. the lower the %, the faster. an hour ago i was at 31%. barely used the phone (few texts and checked FB once) and now its down to 20%.
     
  8. Coupz macrumors regular

    Joined:
    Dec 24, 2013
    #9
    I have the same behavior under 50% and will get a replacement due to my camera has moved. Will report when the replacement arrives.
    Facebook is not light usage. It has to load a hell lot of pictures and Facebook is a real battery hog.

    I can get around 4-5 hours of usage from the first 50% and at around 8-8,5 hours my phone is dead. Once I has 5 hours and 15 minutes from the first 50% and my phone had 1% with 8 hours and 30 minutes.
     
  9. JimPrn macrumors newbie

    JimPrn

    Joined:
    Aug 26, 2015
    Location:
    Bryan, Texas
    #10
    Ok, I solved this situation on my phone. I had tried all of the above potential solutions and none worked. I had all of the symptoms, high CPU usage, hot phone, rapid battery drainage.
    Ultimately, this issue was resolved by turning off automatic iCloud backups. I can only speculate as to why this was causing the problems. Slow internet uploads sounds reasonable but my connection is pretty quick. Was the backup getting stuck in a loop and never stopping? Im not sure. But, I no longer have the issue. I just backup to iCloud manually. Problem solved. Hope this may help your situation.
     
  10. martinwinlow macrumors newbie

    Joined:
    Jun 7, 2010
    #11
    I am having this issue too both before I updated the firmware to IOS V9.2 - and still have it after upgrading to 9.2. It was fine untill a couple of weeks ago having had it for 11 months or so from new. l lose about 1% per minute even without any apps running and with all radio transcievers (GSM, BT & WiFi) turned off. Tried wiping an re-installing from a USB backup. The bad heating has gone but the battery usuage is just as bad. CPU usage never falls below 50% (using Status app). Anyone got any more ideas? I got my 6 from my phone provider amd would rather not be without it for any time at all. So, if I can fix it myself I'd much rather do that than send it off. MW
     
  11. martinwinlow macrumors newbie

    Joined:
    Jun 7, 2010
    #12
    So, (some tinkering later...)
    So having tried installing Status app to see what was going on behind the scenes I found it doesn't do a process list. Researching an alternative that would show
    application process info (to try to pin down an app that might be causing my phone its problems) and, before I found out that it doesn't do process info for IOS9, I installed SysStatsMon lite. Miricle of miricles, CPU use immediately dropped to a sensible 5% or so when idle, with all radios working and zero heating! It's like SysStatsMon's discipline has forced whatever was causing my issues to go away. Anyway, I paid for the app and would recommend anyone with the same heating/battery drain problems to try the same solution. I'll report back in a few days with an update. MW
     

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