Please help! I have a few issues with my dryer:
1/ When starting cold, the dryer needs to be given a start by turning the drum. otherwise, the drum won't turn and there only a humming sound.
2/ On Normal Mode, it runs only a few minutes then shut off. I checked the exhaust pipe and all is clear. There is heat in the drum. It runs normally in Quick Dry mode.
3/ About four days ago, it had a new problem. It ran only about 2 minutes then stop and then back on then stop ( like the wrinkle prevent mode), no matter on which mode. I did some research and though it may have a problem with the centrifugal switch, so I ordered a new motor. And then on the day the motor came, the dryer ran just fine on Quick Dry mode.

Now, I'm having issue number 1 and 2.

Before getting all of these issues, about 3 or 4 months ago, the dryer ran with a loud buzzing sound and there is a time I can smell something was burned.
Please help!! Thanks in advance!