No one yet?
I suggest phoning the mfgr. for some advice if not already done.
I do wonder though if the heat is having difficulty escaping the cavity. This has been discussed here many times over the last few years. If the boat side that has the fridge is getting heated , SUN, then the fridge may not be able to dump the heat.
Is there a fan blowing to the outside or at least to the saloon? If not then check the temp in the fridge cavity. at about half way up. There are transmitting temp sensors around. I got one ,although years ago now, from Radio Shack. Buy a remote reader. Mount it inside near the cavity top and see what it says. The remote will tell you the cavity temp at the top.
On my own, now older boat I had similar trouble, batteries dieing to soon, fridge running constantly with no shutdown for hours on end untill the sun disappeared. Mine was made worse by black paint on the sunny side where the fridge was located..
Anyways I modified my Norcold with the old swing motor and adapted a fan of suitable voltage to blow to the saloon inside. Made a world of difference although not perfect.
A few year later I changed fridges and got a 12DC/ 120V Ac fridge. THe mfgrs. made provision for a DC fan to br run and controlled , ON/OFF, by the fridge. THs time I exhausted the heated air directly to the exterior and it works very well.
One caution , use only one fan. Two smaller 3" ones sounded like an aircraft taking off. NOISY. The single larger 4"fan is almost unnoticeable. It turns on/off to regulate the cooling and is barely noticeable.
They and it, 4", exhaust now directly to the exterior.
The fans are typical so called computer fans drawing about 100-150 mA at 12 V.
Did this about 10 - 15 yrs ago.
But the fridge MUST be able to dump the heat to the exterior easily.
If you have no venting to the exterior then you very likely need it.