its your hub.. at 200M you are right at the .9A most hubs can put out..
try going down to 196.88
Sorry, I should have mentioned. Now that I am troubleshooting, I'm running at 125mhz, just to se if it'll perk up. Doesn't matter, on the hub or direct connected to A PC, it just want start hashing.
The other unit runs fine, at 200 MHz still. Both were running for weeks with no issues until the reboot.
Try plugging the one in after cgminer is running (hot plugging it).