I'm struggling an issue since a couple of month.
I'am using kstars and ekos since almost two years now.
But this summer I started to find that my astronights sessions failed beacuse of eqmod disconnection while I was away
Sometimes it works, for hours, for night, sometimes it disconnect several time in the night.
When a disconnection occurs I cannot reconnect eqmodmount from Ekos, I must go to my observatory and physicaly switch the USB port on the computer, then in ekos I have to scan port and affect the new com adress (com0->com1->Com2...)
I first thought it was a cable issue but with a new one nothing change.
So neither of the logs show any issues. The first log doesn't contain any EQMod logs and the second one shows normal EQMod operation. What's your mount?
My HEQ5 had random serial disconnection issues due to loose power connector. I added a separate lockable power connector in parallel and didn't have any issues after that. So that's one thing to look at that the power connector is secure.
To me sounds like a bad cable/connector.
I had/have similar issues with the power of the mount computer and the USB-C connector of the 290MMmini guide cam. Both would sometimes just disappear, either by touching, or even from wind gusts