To start, I have only used this machine less than 10 times since purchasing two years ago.

I have been correcting an F150 for the last couple days, and yesterday the machine developed a more intense vibration and noise as compared to the usual shaking and noises the PC's are famous for. It sounds like a bunch of rocks crashing together (again, much more so as compared to new) and power seems to slow down intermittently. It's was 95 degrees out yesterday and I was worried that it may have overheated.
I just went out and started to correct a new panel and the machine was smooth for all of 3 minutes and the problem is even more apparent today. I feel like it's about to die but before it does I am wondering if anyone has any ideas about what could cause this issue and if there is anything that I can service on the machine.
I have always used the proper gauge and length heavy duty extension cords.
To say that I am disappointed is an understatement.