Just my 2 cents here. But since last week, where I was on a bike trip, I have used my Edge with Bluetooth disabled. And guess what - I have not have a single reboot or freeze. That's about 35 hours of training...!
Of course non of the connected functions work, but segments and navigation was without issue for me.
So if you prefer stability in favor of functionality, try switching it off and see if it helps.
Ps - this goes for beta 4.01 and 4.11
