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My LG Nexus 4 runs stock Android 4.2.2. I use Bluetooth for phone calls with a one-ear headset (Plantronics M100).

Sometimes I notice in the power toggles menu that Bluetooth has turned OFF and when I go into the BT settings the slider is indeed set to OFF. When I touch the slider, it moves to ON but after a fraction of a second it quickly moves back to OFF.

Sometimes Bluetooth is even reported as ON but it still won't connect to any other BT device. In this state, I can turn BT off and then on again, but it doesn't resolve the problem.

Only a device restart seems to resolve this, so that I can turn BT on again. This happens every other day or so.

Is this a bug in Android? Is there something else interfering? How can I troubleshoot this?

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I dont know whether this something to with LG, I experience this glitch occasionally in my rooted LG Optimus One (P500), running stock v2.3.3 ROM. I did not face this problem with ROMs from CM7 to CM10.1 –  Narayanan Mar 18 '13 at 10:11
    
I've experienced this once, I believe after I tried to turn on bluetooth by long-pressing the toggle in the quick settings menu. Do you turn bluetooth on and off a lot? I've found that it isn't much of a battery drain to leave it on without anything connected. –  Velociraptors Mar 28 '13 at 22:18
    
@Velociraptors: I use a profile app (Llama) that turns BT off at night. I'll try leaving it on and see if it helps (and how it affects battery life). Thanks! –  Torben Gundtofte-Bruun Mar 29 '13 at 8:50
    
I get this too. FWIW, it's not related to turning Bluetooth on and off a lot - even if I leave it on, it turns itself off and this bug manifests eventually. –  Simon W Jun 23 '13 at 7:36
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