If you are starting the fridge with propane and
if this only happens after the trailer is not used for a while,
then the best guess is that the propane supply lines have leaked down.
If the above are true, light a stove burner for a few seconds. That will fill the propane lines back from the tank to the appliances. The fridge should start soon after that. This is a common and normal occurrence.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.