Q: What are the known issues?
A: Issues that I can remember:
Bluetooth
Video playback - many formats are not recognized or give errors
Video recording - especially HD
Vibration and haptic feedback can be better
Auto brightness
TVout
FMRadio
Some users lose network connection after sending a SMS (all on T-Mobile Austria it seems?)
Some users report photos on the external SD-card seem to get deleted
Issues when using the 2G/3G-Switch, which can only be solved by a wipe and reflash
Overheating problems, caused by some misbehaving app, most probably Mediascanner/DRM
USB host mode