Atwood Fridge LP Question

This 8 cubic foot unit is just over three years old and has never been an issue on electric or gas. It's been off for about a month, spending most of that time at a dealer awaiting a replacement awning. This morning I turned it on gas for our weekend trip and it burped a few times trying to light but did only for seconds, so I turned it off. I loaded a few items, then tried it again and it lit. But on returning an hour later it was off. So I got one of those cans of air used for electronics dusting and opened the access panel outside. There didn't seem to be much exposed, but I blew both ends of the gas line and shot some up the flue and it's functioning just fine. I assume it was dirty but am wondering what you all think, in case there's more to it than I think. I won't be reading or responding until we return in a few days. Thanks.