I know it has been a year but I wanted to follow up on this post for future readers.
It looks like the thermocoupler was flaky. I was getting ready to replace the whole water heater but found a seller on Amazon that had pilot burner/thermocoupler assembly on sale for 17.00 so I figured it was worth a try.
I also noticed a lot of white corrosion on the fitting from the thermocoupler that goes into the gas valve on old part. So I cleaned out the hole in the gas valve with a q-tip till no more white residue came out and replaced the old assembly with the new one.
Zero flame outs in three days with a family of 5 using it. Also note I set the thermostat on the gas unit lower than the electric heating rod in hopes of some slightly lower propane use.
Here is a link to the photos.
Suburban SW6P Pilot Burner Assembly Replacement
