the motor sounds like its strugling, when you press on the glass very lightly it will pop up. Any ideas?

it pops up and slides back fine, just wont pop up by itself

 

take it ALL out, clean clean and clean, then lube all tracks properly, then re-install. if you still have an issue after that then start looking at replacing the motors or more likely the gears that control that function. Usually during cleaning you will find the problem