Does anyone have any idea why my new upright dryer would be making a thumping sound, It's been doing it since day 1 and I've had it about 3 months now. Same sound, no worse. Sounds like a pair of sneekers is in it... any ideas?

Feet aren't stable and or level, or the belt is loose. It should be under warranty?

Everything is stable and level, yes I'm still under warranty but was thinking maybe it's something simple.
Thanks