This just started after installing a fresh copy of tumbleweed a few weeks ago, I then installed Linux mint to see if it was /system partition encryption/ OS / desktop based (KDE/Gnome) with no change. The only thing I can think of is the Kernal version was newer on the freshly installed systems, but I believe Mint might be using an older kernel. I have removed the system volume encryption also with no change.
The only other piece of data that might be relevant is that I have disable sleep and believe it still freezes when the monitor turns off.