sidewinder fridge problems

hi
im after any information from people who have/had an ABR sidewinder fridge.
i have one and is permanently mounted in the back of my rodeo running off a 100ah battery. the batt gets charged using a 3 stage charger everynight (or second night at worse). i set the temp to -2 and the fridge runs at about 5 degrees (in about 33 degree ambient), the last 3 nights it has jumped up to around 20 degrees. it still has power but its as though the compressor isnt kicking in. i turn it off and on again and it seems to run fine again. only seems to happen at night.
ive checked all connections and the fan is clear from dust etc.
any suggestions?
the fridge is connected to the battery when it gets charged, but i didnt charge it last night and the fridge still ran hot, so ive eliminated the charger being related to it.
the fridge has been good so far except not being able to maintain a constant temp, it varies alot but only by a few degrees, this is probably normal.

thanks in advance.
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