Log File location
The log files are located in the C:\ProgramData\HealthCast\Lynx\logs folder. There will be one for each day, which will be reflected in the file name (log-yyyymmdd.txt). You may delete them, as needed, but you may have to stop the Lynx service to do so.
Lynx continually writes to the log file, and if you are having issues they are a good place to begin your troubleshooting efforts.