Dometic RM2501 won't start on gas right away.

This is in a 89 Lance cabover. Anyway the fridge was working great. Turn on the gas,light flashes, then hit start,gas lights, fridge is operating. Then it went to turn on the gas,drive to

the store and back and then maybe the light would be blinking, then it would start. Battery in camper fully charged.

second issue is the burner tube corroded and two of the grates fell into the tube, have one ordered. This isn't connected in some way is it? I see there is an electric spark tube thingy

there.