Sounds like a serial port driver problem.   I started having some issues with 
my Prolific adapters in Win XP after installing some EEPROM burner software.  
It shows up as garbaged data after typically a day or two of continuos use.

It could also be related to another issue in v5.0 if the Tbolt has bad signals 
from the sats and starts reporting sats at az/el 0.0   This tricks Heather into 
thinking the receiver is actually a Datum Starloc and Heather enables some code 
that tries to work around the NUMEROUS bugs in the Datum firmware.   One 
symptom of this is the screen starts showing "GPS time ok" in the corner of the 
screen if you had the Tbolt set for UTC time and you start seeing corrupted 
messages.
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