Having problems here too, samsung galazy s7. after the update my polar beats app started locking up on longer rides. just started using wahoo fitness. Got a speed sensor on the front wheel and my heart rate monitor on my chest. phone on the handlebars I'm getting 3 out of 5 bars on bluetooth signal. speed sensor wont connect on the back wheel. not happy. Also its having trouble finding devices and connecting to them. so far restarting my pone every couple days when i am having problems seems to be a temporary fix.