upXtreme network connection drops and crashes

Hello,

we experience problems with an upXtreme board that we bought about 10 months ago.

Over the last couple of weeks did we stumble upon non-reproducible network problems, which arose every few hours to every couple of days.
Network connections dropped completely, sometimes when the upXtreme was under load, sometimes when it was idling.
This got more and more frequent, even to the point, where not only the connection dropped, but the network adapters were not even recognized by the operating system anymore.

First we thought about a software problem, so we reinstalled everything, tried different operating systems etc. None of that helped.

A few days ago did we encounter new problems, not only did the network devices stop working, but the whole upXtreme board started crashing.
However: We found a way to reproduce the crashes. When one of the USB ports at the back of the upXtreme board is being used, slightly touching the device that is plugged in, near the USB port, crashes the upXtreme board.

This is independent of the USB device plugged in. It happens with USB sticks, keyboards etc.

All in all do we suspect a problem of the upXtreme itself at this point, and not a software problem.
Furthermore is the board unusable at this point, the crashing / network dropping happens at least every few hours, so this is nothing we can work with.

How should we proceed about those issues?

Regards,
Jonni