Yes for sure, among Loxjie at minimum. My point was, if you're going to stay within one brand (Sabaj) rather than performing "mix and match" with SMSL labelled components there is no longer tone control available with Sabaj's poorly equipped 2022 amp(s).
I am A20a (2020 series) owner and went through these issues you mentioned which required DIY repair with replacing faulty PSU boards.
I have had many discussions with Sabaj's design staff about the problems with the A20a. But the fundamental solution seems difficult.
As a result, the Sabaj A20a 2020 has been discontinued along with the A8.
The new product A20a 2022 will probably be the successor to the A8/A20a.
I'm looking forward to the performance of the newly adopted MA5332MS chip, but the high level of Residual noise is a concern.
Although it is a product of the same group company, SMSL A300 is equipped with NJW1194 electronic volume + EQ to differentiate it.