My whirl pool dryer has to be turned on bout 3 to 4 times

Ok, check the exhaust hose for obstructions. make sure the blower assembly is not clogged and, the hose is clear of any debris. the exhaust hose should blow out hot air forcefully. if the force of the air isn't blowing hard, it will not create a suitable drying environment for the element. this poor ventilation will also damage the heating element or burner Assembly.

Now, if there is sufficient air flow out of the exhaust hose, this will confirm control failure. replace the dryness sensor and control board in this case.

Here's a quick way to test for clogs. take the hose of the backside of the dryer then, start the cycle. if the drum sorts to become hot after a few minutes with the exhaust hose removed form the back of the unit, this will confirm a major block in the hose or blower assembly.