First I had no problems with Big Sur, then about 2-3 weeks after upgrading my MacBook Air (2020 13" 1.1 Ghz i5 8GB RAM), it also started to slow down to the point that nothing worked anymore and it just started rebooting again and again.
Resetting the SMC did help, but only for a couple of days.
I am very much disappointed - this was my first Mac and I bought in order to not having to deal with fixing stuff all the time.
And now this problem after also not being able to use a simple external keyboard last year due to problems with USB-2 devices that Apple only fixed after months of waiting.
MsHnn
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