another fridge problem

OH no not again,

So I'm now used to the old freezer freezing up and stopping cold air getting to the (above) fridge, defrost overnight and or get a hairdryer to said part

but now I have the opposite,

the freezer is nice and cold (at zero degs) no ice build up no defrosted water in the bottom

but now the fridge is getting cold, I like to keep the fridge at 7deg's due to insulin storage,

the settings for the fridge and freezer usually runs around 3 or 4 setting mark
the fridge thermometer started to go down, so in 24hr steps took the settings down, to now both are on 1, 1

the fridge is reading 3 or 4 deg's and freezer stable at 0 degs,

I can't afford my insulin to hit freezing otherwise it's destroyed, I've powered up the mini fridge,

any ideas, could that trap door thingy between the fridge and freezer be stuck on ?

the fan in the freezer seems to be permanently on ?

txs !

analog freezer thermometer
digital fridge thermometer located in door compartment right next to insulin