We have a Crusader 321RES 5er with residential Samsung fridge. The first few times we were out the fridge held its temps, 0 freezer, 38 fridge, really well using the inverter. Now, as we finished our trip and returned home, each time we stopped, after about a 6 hour drive, the freezer temp was 26-29, and the fridge 56-59. When the inverter button is pushed the green light indicating proper operation comes on, but when we got to our nightly stops the light was off and temps up. Once reconnected to shore power temps go down and fridge works works great. Any ideas on what gives? Thanks.