HTC One M9: common problems and how to fix them

Auto-rotate is an age-old smartphone feature, but it's still prone to the occasional bit of misbehavior. If your One M9 doesn't auto-rotate, first go to your Quick Settings and make sure it's enabled. If it is, but it's still not working, you may need to re-calibrate your phone's G-Sensor (a flashy word for gyroscope).

    To do this, go to Settings > Display & gestures > G-Sensor calibration
    Put your HTC One M9 on a flat surface, then tap Calibrate and wait until the screen says 'Calibration Complete'
The Snapdragon 810 chipset powering the HTC One M9 got a lot of stick for its tendency to overheat during use. When we tested it out in our Snapdragon 810 vs 808 comparison however, it looked like HTC had fixed the widely-reported problem. However, if your experience differs from ours and you're still experiencing overheating, then there are a couple of workarounds you can try.