Bluetooth issues imac

al2813

macrumors member
Original poster
Oct 19, 2014
32
20
Belgium
Second time in a row with Apple support and still not sure what is going on. My magic mouse is not reconnecting every time that my imac (27 5k late 2015) goes to deep sleeps and wakes up. In the first cases I had to remove the mouse and than re-connect it. Today even this did not work. In both calls Apple support took me via an SMC (yesterday) and NVRAM (yesterday and today) resets. Problem solved but i suspect it will come back the next time it goes on a longer sleep.

Any idea what it is? How can I test further. My apple care just expired so am out of warranty - ouch.
 

mikehalloran

macrumors 68000
Oct 14, 2018
1,600
390
The Sillie Con Valley
Did no one inspect the antennae? This has been an issue when weak bluetooth signal is a problem.

If it comes back, you can try to raise a stink that is was never really fixed — good luck with that.

Worst case: there are inexpensive bluetooth receivers that plug into a usb port and work quite well.
 

a.spilevoj

macrumors newbie
Jun 27, 2019
3
0
I have resolved that with the help from other forum users and some YuoTube. Resolved for good. Here it is:

I just bought the new iMac 27 i5 and started having same issues with the bluetooth, but in my case the BT would turn off completely until I restart. No other solution would work, only restart. So I read your forum, followed few steps, including one that is from YouTube and so far I am good:
1. Removed Android Transfer app (that changed the way the BT was switching off - now I still had BT but it would not connect back to my mouse and keyboard, but at least it would still be on)
2. Run the sudo line in Terminal:
sudo defaults write /Library/Preferences/com.apple.airport.bt.plist bluetoothCoexMgmt Hybrid
P.S. Thanks to @campyguy
3. Watched that video and followed the steps:

If earlier my BT would go off almost every time I wake up iMac - now I do not experience nay issues. Well I have only 12hrs experience since I run all the 3 steps last night but since then so far no problems anymore.

I read some smart people comments and it looks like BT is conflicting with Wi-Fi 2.4gHz. So the steps above fixed that somehow (at least for now). Hope it will also help you too.
 

al2813

macrumors member
Original poster
Oct 19, 2014
32
20
Belgium
Thanks for the responses. I ended up solving the issue by doing a clean install. There was probably some rogue app that ended up messing up my BT. It is working flawlessly since