Problem also occures with Com port 1, non-usb. I have the same problem with as WS2308. Had it running through a USB serial for a while with no problems. Then started having the problem described. Moved it to a regualr on-board com-port. Same problem just does not happen as often. I think it is a timing issue between the software and hardware the rather then a hardware issue alone. I do not have the problem when using the Heavy Weather software, only WUHU. However, i do not think it is strickly an WUHU problem either. As i said, it appears to be a timming issue between hardware and software.