Hey again!
Were you able to test in a new admin user?
The fact it worked in safe boot and then initially after a restart, but happened again tells me there is software on your Mac causing a problem, (If not a file system error that couldn’t be resolved by safe boot alone),
This would mean targeted troubleshooting isolation steps to find the non-Apple culprit causing troubles, can you confirm, after a good amount of time in safe boot this doesn’t happen?
Accountsd is a native Apple process, however third parties also use this process to work with the OS, so it’s not necessarily the OS at fault, from what I know it could very well be a third party provider or program that need to fix it on their end, or work with their Apple contacts to do so if it’s not something they can work out on their own.
To you and Dima61, were you able to fully test in safe boot and in a new user?
If in a new user and it works fine, there are several possible steps to take to get a solution, same as the safe boot results. This would tell us for sure if it’s corruption in the user folder, or a possible third party conflict, or truly an issue with the OS.
In either case hope it works out, just let me know if I can help further.