My LGE0442W takes forever to dry simple loads of clothes - for example, 3 towels takes more then 2 runs of 50 minutes each on high temperature.
When I take them out, they don't seem that hot but they do seem warm.
In my experience a heating element is either bad or good - not half bad. So maybe there's a resistor or something that regulates the heat output that has gone bad?

Any ideas would be appreciated.

Yes. Last year I cleaned the entire duct system out. all the way from inside the dryer to the outside of the house. I was really hoping that would've helped but it didn't.

The tstat might be bad the temp might not be cycling right but ive had customers that have had the vent cleaned but the roof cap was never cleared