Hi Matty,
I have a 44. I tried many things, but on mine the issue was not enough insulation around the fridge itself. Even upgrading from the Danfoss BD35 to the larger BD50 and several evaporators, nothing really worked until I added more insulation.
Perhaps this was fixed in the 45's.
Fibreglass and 25mm insulation just didn't do it.
I also found along the way that I was losing some voltage from a poor connection.
Hope this helps
Cheers
Bob