Norcold Fridge - N8XRT - not cooling/shuts down when too hot

[KingstonCamper]

Anyone have any issues with this 2 way fridge shutting down when it gets too hot out?

When we store it in our driveway in Ontario (extremely hot these past few weeks), it will stay cold for about 2-3 days and then shuts down. Right now it's 30 degrees C in the fridge and it's on and set to high.

I've tried unplugging the Thermistor, waiting overnight and then restarting it the next day. I've tried it on both LP and AC. The trailer is level, etc.

Can't store any food in it when we go to leave to camp, but when we arrive at the campground and turn it on, it will start up after a while and by day 2 it's cool enough to store food in it again. I'm baffled.

Thanks

Kevin