This problem indeed is far more complex than it may seem. For many a simple solution is NOT the fix and when Genius Bar folks claim it is a hardware issue I highly doubt that so many people suddenly have hardware issues after upgrading to ios7
I have heard many people try many things, and no one seems to have a complete story where they have tried everything and the problem still persists so here is my story with bluetooth…
I have an iphone 5, upgraded to ios 7 with no problems under ios 6
My wife has the same phone & upgraded with the same path as me without any problems.
I find that my bluetooth crashes frequently. The symptoms for my situation include:
bluetooth disconnecting from any type of bluetooth device tested
Car (3 different tested)
Fitness tracker (2 tested)
Wireless speaker (1 tested)
hands free devices (3 tested)
The control center may show bluetooth on or off, and you can toggle the setting in the control center, but that does not result in any changes.
The bluetooth icon in the top right of the screen disappears.
In the settings under bluetooth it just has a spinning wheel and will not display on or off.
Attempted fixes
Restart phone - this rarely fixes the problem
Wait - sometimes waiting can work but I need to wait for 1-2 hours. Then bluetooth will crash again.
Reboot by holding both buttons - this will generally work, but only for a short time before the problem returns after 10-15 min.
Reset all settings - no effect
Erase all data and reset - no effect
Rename phone - no effect
Putting phone into airplane mode and back - sometimes works, but problem returns
Putting into airplane mode then resetting settings - no effect
Backing up phone and restore - no effect
Upgraded to 7.0.1, .2, .3, .4 - no effect
delete phone parings on ios & bluetooth devices & repair - no effect
I am hoping that this is a fix that can be repaired in 7.1 as I live 5 hours away from the closest Apple store…