Is there any evidence to suggest that a loaf of bread - being taken out of the freezer - will go mouldy quicker than the same age loaf that is not first frozen? Imagination, perhaps, but the frozen ones seem to go off faster....
I suspect this may be due to the high-water content in bread which is adversely affected by freezing. The bread doesn't go mouldy quicker - just stale and dry. You could just remove and thaw a few slices at a time or buy smaller loaves for freezing.