[jimcol]

Could it possibly be going off because the refrigerator has reached the desired temp? It will come back on when the box warms up enough and the electronics tells the burner it needs more cold. Jim
Whoops guess I should have finished reading your post before replying. I now see it is on all gas appliances. Like others have said either regulator or hoses. I'd try running with just one tank either curb or street side and see if the problem follows one side or the other. That will help eliminate things to replace. I know on mine the streetside red regulator went bad. I just eliminated it and all has been fine for 3 years.