Check for a leak in the hose somewhere. Many times even though a hose does not seem to be clogged it still is. If you have a bendable wire with a brush on the end which can be used to clean all sorts of things, run it through the hose to the internal parts to make sure nothing is clogged further down. It seems to be running normally otherwise?

Benjamin

When you pull out the bag/canister make sure there is nothing clugged in there. and make sure there is notheing in the suction hole by the brush.

hope this helped.
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Motor must have turned weak. check if motor is running with the max speed as it should be.