UPDATE: Well, and again - cmdagent.exe and his favorite 8% CPU all the time.
So, as I expected - new version, old version, the same bug, no matter what.
I suggest to release another version, fix completely different things and recommend to test it. 
As I said - it’s rare, it doesn’t happen every day, but it happens and then the only solution is to restart PC.
At least made some button like RESTART CMDAGENT or whatever. Can’t find a bug for years - just made working workarond.
Properties from Process Hacker.
It’s strange, because there is no read/writes (only “other”).
I/O Other Bytes - The number of bytes transferred in input/output operations generated by a process that are neither reads nor writes, including file, network, and device I/Os. An example of this type of operation would be a control function. I/O Other Bytes directed to CONSOLE (console input object) handles are not counted.
Zero disk read/writes, zero internet, but it still working and processing (probably itself) even when I disable completely internet card and basically all activity. CMDAGENT just “working” - made some crazy internal operations in loop.