The room where the tumble dryer is located is too warm.
Ventilate the room thoroughly.
The drying process goes on too long or even switches off.
Ventilate the room thoroughly.
Clean the fluff filters and the plinth filter.
Remove visible fluff from the heat exchanger.
Disentangle the laundry and remove a few items.
Start a programme.
Move any objects, such as a laundry basket, away from the dryer.
Spin in the washing machine at a higher speed.
Open any zips next time.
If the problem recurs, dry these items using the Warm air timed drying programme.