If installed correctly GasStop will only shut-off if there is a major problem with your system e.g. a major leak or catastrophic regulator/system failure. If no major leak is present it may be that your system is drawing too much gas through the GasStop and therefore tripping it.
At the time of use, were you using a lot of propane? Was the weather cold?
It does sound like you are pulling a large volume of propane through the GasStop.
Each GasStop RV model (GSUSA1 and GSUSA2) is rated to 70 SCFH (approx 75,000 BTU/hr). This means that if you a running a system above these ratings the GasStop will trigger and shut-off.
Our extensive testing shows that only a small number of RV propane systems demand above 70 SCFH (75,ooo BTU/hr) – sadly for the time being we do not have a GasStop model suitable for this particular type of heavy usage. Watch this space!
In the meantime, if you wish to continue using your GasStop, it may be an idea to look into more efficient furnaces and appliances that operate just as well, but use less propane. This way you will continue to get all the comfort and all the safety you wish.