fridge temp fluctuations

Just had our first outing in our new trailer. All seems well with the exception of our fridge temps. Turned the fridge on electric the day before we left. By morning it was at 35*. Switched to propane for the ride (about 5 hours) and were at 40* by the time we got to the campground. Back on electric temps came back down. The next day the temps slowly climbed up to 44* (low 80's ambient temp) overnight temp went back down to 33* then climbed again while on propane for the trip home.

I know the fridge works on propane as ive run it from full warm to cold in the driveway. Im more concerned with the rise while plugged in. Is this normal operation or something I should look into? I dont know the model number off the top of my head but it is a standard dometic 2-way.