I recalled an issue with your Dometic fridge and decided to re-familiarize myself with it. Those fridge units and other Dometic models had a recall for fridges built in the late 90's and expanded to the mid 2000's models. The recall was for a fire hazard and the reset is an overtemperature switch and was retrofitted as part of the recall kit. Its purpose it to remove 12VDC from the circuit board thus disabling the refrigerator in the event of an overheat or fire condition. Very dangerous before the recall as I understand.
Because it is the thermofuse that is popping to protect you from a potential fire, I believe your unit has a failed cooling unit and that you should take it in to get repaired. You can try to get Dometic to replace but I really doubt they would do that. Worth a try, though.
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD