Comment 31 for bug 1962180

It may be kernel or other package, but kernels was the only dpkg.log entries between a the stable >100MB/secs situation and now. I just installed the 5.13.0-1022-raspi (see my edit above) followed by a reboot. As noticed the situation seems always better during a small amount of time after a restart but anyway I just transferred 10GB with a very stable 105-108MB/sec.

Their are indeed small system interactions (SMART, script and other), the same as always. I keep digging and have to say thank you for the time you spent on this already