Something is wrong.
If the MFG says that is normal a) their full of *____, b) your response to them should be "then they all need to be fixed, and you can start by fixing mine".
This is unless of course you are talking about Harbour Freight (or the like) being the MFG.
If you have something like PC, Hitachi, Bosch, Dewalt, Makita, etc. then something is wrong, and I (personally) wouldn't use it.
The shaft is spinning at 20,000 RPM. That bearing is either crushed, or within a tolerance that isn't right. Hence the heat build up. Keep running it, and something will break.
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Regards-
Noddy
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