Trinity Bendix wdr1041 w dryer timer decreases rapidly and shuts off early when clothes are still wet

Hello, I have a tricity bendix wdr1041 w washer dryer and recently when using the dryer settings, the timer that is set decreases rapidly down so every cycle lasts around 15-20 mins and shuts off even tho the clothes are still wet. I’ve cleaned the whole machine and don’t really know what else to do to fix it. Can someone please advise? Thanks.