Not sure about how to maintain a "frig" but I think we're talking about a "fridge".:B
On my previous trailer, there was a recall and they added some shielding around the ignition area of the fridge (where the flame ignites).
But if flames errupted, I'm wondering if there wasn't a gas leak and there was an accumulation arount the ignitor. Then, when the fridge was started...poof!!
As to maintenance, in addition to keeping everything clean and debris free, I'd check for any gas leaks using a sopy solution or the stuff you can buy that's already to go. Seems to me if there isn't any debris around the ignitor, and there aren't any leaks, the risk of fire is pretty low. But, does anyone know what can happen if the circuit board fails?????