I'm on Mac, running system 9.6 synching my treo 180 through local USB.
After about 9 months of no synching issues, this started.

When I synch, the box appears on the desktop and it cycles through "to-do list", "memo pad", and "datebook". Then, it shows "address book", but it only shows it for about half a second and then the box just disappears. The synching just stops, and gives no explanation,, not even in the log. About a minute after the desktop stops synching, my treo 180 realizes it and gives me a warning that the connection between the handheld and the desktop has been lost.

I've looked over the handspring/palmone support pages, and nothing resolved the issue.

I've also searched this site, and found no specifically similar discussion.