I am syncing my X51V with two PC's. A laptop running Win2k and HomePC - XP. With my laptop I am syncing thru IR my contacts and calendar while with my homePC only files.
I lost my USB syncing with both of the PC's. IR sync is still working with my Laptop.
When I insert PDA into its USB cradle, the AS4.1 prompts with a constat "connecting" message but that's it.
I installed on my X51V the VxSniffer (www.cam.com) and noticed that the communication failed due to 169.254.2.1 --> 169.254.2.2, Port 2224 --> 5679. failure where 5679 port is unreachable by the PDA. The same failure appears regardless of my Firewall state (Enabled/ Disabled). When I run 'netstat -a' I can see that my PC listen to this port.
BTW, when I hard reset my PDA, the USB sync starts working until a point where it stops.

Any ideas ?

Axim X51V, ROM A12, SD 512M

I've seen simular issues a couple of times and its been the PC. One thing is sometims there is a windows mobile device in the device manager. If you have one there delete it. then connect the axim.

Then if that did not work., the usual PC dance, Reboot, connect. it that does not work leave connected and reboot. still broke remove axim and uninstall activesync, reboot and install again.

I blame pulling the Axim while it is in the middle of syncing for causing this issue. So I try not to do that anymore.

Anybody know how to stop it from syncing every 10 minutes when connected by USB cable?

 

Well, I have already tried that several times with the same results. The only solution that won was a full hard reset
As for your sync problem, search for the following thread: "Step-by-step: Killing ActiveSync in cradle, for charging via USB". It works.

Axim X51V, ROM A12, SD 512M