Twice since I've updated to (31) I've had comms hang. Both were after deleting and then reinstalling all the pmm files. Once ii don't show them in the window after the transfer and unplugging and replugging fixed that, tried it again and that worked but when I changed to the Date/Time panel and clicked Set Now it failed, then I clicked set date/time and that worked and following that so did Set Now.
Also when I copy all the files across they seem to go fast-fast-fast-slow-fast-fast-fast-slow. and whenever it pauses the blue light comes on.
Sorry it's not much to go on.
Ira