I've had the same problem with the trackball icon freezing on the screen as many others have via other forums. I've also had the phone freeze up for about 5 seconds - pressing any button will not do anything - then it suddenly starts working. My reboot time has gone from about 4 minutes to almost 10. Some have had reduced reboots by removing Google Maps - others have no problems with it. The back of the phone gets pretty hot (below battery) when used for more than 5 minutes - possibly the main processor? There also seems to be more problems with phones built south of the border than north of it. Any one else on here having these problems/issues? And yes, I've adjusted my trackball sensitivity several times - I think it may be more of an OS issue.
Also - there is an issue with ringtones/call alert tones not staying as assigned. If you set up a contact to alert differently when an sms/mms is received - sometimes the right alert will work - other times it picks one up at random.