Try to change the usb cable, I had those issues and they were resolved when I changed the cable, before that I tried to flash the firmware, reset the device in every possible way I could find, nothing helped, really weird especially because the previous cable worked for months, then I just changed the location of the device and it stopped working with that cable for some reason (network red 0ms)

I used cable which came with Dell monitor, I guess it's good, it looks solid and robust, usb 3.2 gen 2, 65w max though, but in my case that's enough anyway.
This is temporary solution, I can't use any other cable at the moment.

Right, I didn't think about that at first, because I just moved nano3 from one room to another, I mean what can get wrong in 2 minutes, something went wrong obviously, don't know how and why.
Plus, device was working but in lower watts, showing network connection problems, so my focus was on that.
Today I decided to test it with different adapters, some adapters are not supported (nano3 says so on the display), I was using stock adapter with stock cable btw, which came with the device, interestingly enough macbook pro adapter 140w doesn't even power the device on. Anyway I had one usb-c-usb-c cable which worked with that stock adapter.

My Nano3 was working fine for about 45 days or so, zero problems, it was working in Low mode because of the heat outside and I didn't mind that.
So yesterday I decided to move it to another room, so I unplugged it and just plugged it in the new room, first thing I have noticed is low hash rate, it was always at around 2.4 , but now it is like 0.05 and it says that it is using 15W
That was weird, so after some time of trying to see what is going on, I just gave up and thought maybe it will start working again if I plug it back in the previous place where it was working fine for so long.
Same thing happened there, so I tried today various things, factory reset, wifi change, device recovery flashing, spent hours and hours, nothing helped, it is amazing I must say, in wrong way.
It is some kind of network issue, it can work for few minutes, still with low hash but the network status is green, then it just goes to 0 and it's in red.
Tried changing several pools, it's all the same.
I am really out of ideas, think I tried everything I could, can someone please provide more info on this and how to overcome this issue if possible?