hotpoint fridge freezer model rf08p

Hotpoint fridge freezer problem, fridge works fine but over the last two weeks have noticed the freezer not working as well as it should ie food starting to feel thawed and last night had to empty freezer as no freezing was taking place,also the mains tripped but not certain if the two problems were connected though.The unit is about 11 years old thanks for any help john. 🙁