Samsung SRS2028CVW fridge freezer

Question

I have the samsung (sr-s2028cvw) american style fridge freezer. Just recently it keeps defrosting by itself and half of my frozen food has to been thrown away. I have noticed that it does this when the freezer temperature starts to flash on the front panel display. I do know that it needs a new filter and wondered if this has n e thing to do with what its doing!! Its also started to leak when its defrosting from the water/ice compartment on the front.

Have u n e suggests on what it up with it and can it be repaired??