Hi
It shouldn't however if you suddenly start to get oddball blood test readings then you know the culprit.
Generally speaking fridges are colder at the bottom.
Have you defrosted it recently?
Are these temperature readings from the built in fridge stat or from an independent one?
My general understanding of insulin storage is to keep it in the fridge until needed then it can be kept at room temperature for up to 4 weeks.
Hell, who wants to inject themselves with cold insulin?
If you are in the UK like me its been like living in a fridge since November!
Tony