I recently replaced my dying convection oven with a new one. Very happy with the results as my new one is of much better quality. Almost all over the range micro's are the same size so you shouldn't have any problem finding a replacement. Just dep...
I agree with the supply hose being the problem. One way to test this theory is have one tank open, one closed. Try your gas appliance. If you hear pinging, close that tank, try the other. By isolating tanks you will know if you have a bad supply ...