Don't have an Aria either, but there are reasons for a GFI to trip...
Try the below in any order.
- Possibly a bad GFI outlet... they don't last forever. Try replacing to see if it resolves the issue.
- Possibly water in outlet - check the outside outlets removing the cover (with power off and preferably right after it trips) and insure not getting wet inside.
- Wiring issue - loose or disconnected wire on an outlet in the chain (the GFI protects all outlets wired 'downstream' from it.) - Check for correct wiring with one of the plug in testers with 3 LEDS.. Looks for missing or reversed wires.. Open the outlets and be sure everything all connections are solid.
- Doing its job - an appliance plugged in has a ground fault that is being properly detected... and its doing what it is designed to do - preventing you from getting shocked. See what is in use each time it trips to try to narrow down... Unplug things you might normally leave in and see if it stops tripping.
Not much else I can think of that would be present in an RV that might cause this issue... Hopefully one of the above will identify the problem.