Here's the deal, this has actually been known to happen whether running on the gas or electric. Depends on which law firm website you read.
This problem is long standing, recalls have been known from the early 2000's on up. The problem is the coil system and some claim that it is built thinner, thus allowing better chance of a leak to develop and if this happens any spark has potential to cause a fire. This is RARE mind you.
Some people opt for the compressor refrigerators and avoid the absorption refrigerator, requiring a generator or inverter to run on the road. In very basic terms, your absorption RV refrigerator works like this. It uses heat, and a combination of ammonia, hydrogen gas, and water. These chemicals react and go through various tubes, and the evaporation and condensation process of these chemicals are what cools the refrigerator. In the case of using shore power or a generator, the heat is produced by an element. When electricity is not available, an open flame from the L.P. gas is what is used to heat up the chemicals.
If you want to help decrease the chance then all you have to do is turn the switch to "off".
That simple.
I did some looking around and didn't find anything new on recent fires in RV's that was anything different than what we've seen. The difference is you're seeing more law firms posting about possible lawsuits. Some people don't ever run theirs on gas, even when going down the road because there is also a small chance of an explosion at the gas pump with the open flame back in the fridge while you're filling up the tow vehicle.
Just select to turn it off when not hooked to shore power and problem solved.
In theory...