My 950XL manages to reboot on its own... every two days in fact. Such amazing error self-recovery! Wow. So yes they're unfit for purpose even without the app issue. 650s were meant to be for the enterprise but they're incredibly unreliable.Too many times, the w10 phone stops working as expected, and needs to be rebooted
By contrast, my 3 year old Galaxy note works flawlessly.