Is the propane tank fuel shut off valve fully open? And what is the high pressure reading? Should be in the range of perhaps 50 to 120 PSI depending on how much fuel is remaining.
One could also use the "T" handle on the propane regulator to set the fuel low side pressure say at 10 to 15 PSI. Then reset for your lower operating pressure at 5 PSI to see if the issue continues.
As suggest above, it could be a regulator that has seen its better days and needs to be replaced.
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