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It sounds like the belt going to the blower attachment may be slipping. If the snow is a really wet heavy snow it would also cause the blower to not work as well. It just can't move the wet snow and blow it as far as it will in a light dry snow. The only other belt would be the transmission drive belt and it really has nothing to do with the blower attachment, it would only cause the machine to not move or pull itself like it should.
The main drive belt for the tractor will not be the problem as it has nothing to do with the attachment operation, it drives the transmission in order to make the machine move forward and backward. Does the blower work or turn when there is no load on it? If it does then it sounds like the electric clutch may be slipping or not working properly.