I also have the Audeo B90 directs and experienced reboot issues as well, but only with my Android phone (S8+). I moved back to Apple about 6 months ago (iphone X), and wow, reboots issues are gone and the phone app connects much quicker. Probably not what you wanted to hear but i think Phonak has many more challenges getting BT to consistently work across all Android platforms than they do with Apple.