My unit is just short of one year old. Past week it has been forcing less air through vents and twice checked filter and filter fell out with lack of pull through intake. Happens mainly at night and am aware it does defrost but not in warm weather here in AZ. It does not do it all the time but force is less than half of normal. Anyone know what's going on here?

Is the AC unit freezing up? Frozen coils will cause no air flow...