Next time you empty the lint trap on your tumble dryer, have look down the pathway underneath/behind the lint trap.
I just got a 1/4 of a Dyson vacuum cylinder’s worth of extra lint out of the lint trap surround and the ducting down to the condenser matrix.
If you have a condensing tumble dryer, read your handbook as the matrix does need flushing out every so other. I blast mine out un
with hot water in the shower.