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All dryers have some type of roller system that supports the drum as it turns. It sounds like one of the rollers or roller bearings has worn and is making that thumping noise. If you have some basic skills and good general mechanical sense you could fix it yourself. Make sure the dryer is unplugged before you attempt anything.
Good morning! It's common to hear a loud thumping noise during spinning because the load (clothes) are not properly place in the tub. Please try to put the load in order & compress it down. best regards.
It would be unusual for even a Chinese fan to have failed bushings in that short period.
If this unit has a conventional power supply for the magnetron, the noise might be caused by the magnetic field of a large power transformer.
These can have a strong stray field and can cause other sheet metal near them to vibrate.
It isn't dangerous, assuming you don't poke a finger inside, to remove the rear panel and inspect the innards while it is operating. Using something that isn't metal such as a plastic or bakelite spoon (even dampness in a wood utensil can conduct a painful shock), you might try damping the vibration with it.
If you can locate the source, you may be able to kill the resonance by applying a fairly large bead of pure silicone (nothing else) to the surface making the noise.
It it seems to be coming from the transformer itself, I would pull the plug, let the unit sit ignored for a couple of hours (there can be charged capacitors inside) then use a finger to press silicone into the transformer's laminations.
These were once soaked in epoxy in a vacuum container to **** all the air from between the laminations to prevent exactly this kind of 'rattle.'
They probably don't take the time for that any more.
Take off the back panel of the dryer and look at the motor and belt turning the drum. There may be something caught on the drum and is pinned in place causing the noise. The motor could be loose on the platform and needs to be tightened. It is probably something physical and seen causing the noise.