I picked this thing up about a year ago, it was doing this in the beginning but I thought I had ironed the problems out but now they have come back. The dryer functions normally for the most part but occasionally it will stop mid cycle and not want to restart. When it stops and I push the button to make it start there is a loud humming like the drive motor is in a bind and cannot turn the drum. This is also the sound it makes as it stops and turns off. I replaced one roller and am thinking another might be the culprit now but my main question is could something electrical be causing this?

I know it has to either be the motor or something the drum is dragging on, as the problem seems to be more prevalent when the drum is more full. How would I go about testing if the motor is bad?

Well I ordered the motor and it fixed the problem, thanks!

But, when I put it on auto mode it will cut off long b4 the clothes are dry, I have replaced the 2 moisture sensors. What could be causing this?

Hmm, that makes sense but I just had the entire thing apart replacing the motor and there was no obstruction... I can test it like you say but it drys fine if I just use the manual timer.