I have been tracing the problem and it appears in almost all WM5 devices no matter what OEM. I also have found that this issue together with the the battery drain issue appears more often in those devices with SPB Pocket PLUS top bar battery metter, SPB PocketPLUS today screen battery meter and resco file explorer battery meter. But disable them does not not fix completely these issues, it just makes them to appear less often. Having SD Cards and CF Cards together with battery meters addins seem to be a deadly combination too.
You can see more info about this topic in these following links:
http://x51v.blogspot.com/2005/11/x51v-mysteries.html
http://x51v.blogspot.com/2005/10/x51...appearing.html
http://x51v.blogspot.com/2005/10/x51v-bugs.html
Some registry hacks seems to help though they do not fix the problem completely
http://www.tweaks2k2.com/portal/foru...&showtopic=186
http://www.aximsite.com/boards/showt...4&page=3&pp=20
The following thread is a collection of tips, some of them very useful for every WM5 device...
http://www.aximsite.com/boards/showthread.php?t=104366