this is one bug that drives me CRAZY .... there was a bug i experienced like this on my touch .. and they stated that it was related to spb programs, but that doesnt seem to be the issue now...
Phone app randomly opens
HKLM\Software\Microsoft\Shell\ShowTitleBarClock from 1 to 2
http://forum.ppcgeeks.com/showthread.php?t=20807
mine is currently set to 0 on my touch pro