Thought I’d post this here in case it helps anyone else with the same problem (I’ve searched an I can’t find it mentioned anywhere else on the forum but could have missed it).
Since getting my second Spectrum I’ve had a problem where my PC hangs requiring a hard re-boot when I wake the monitors from standby pretty much 100% of the time. After investigating it it appears to be a problem with the NVidia driver (so Eve staff can stop reading now ), lots of people with multiple high refresh rate LG monitors are seeing the same issue (a long thread here on the Nvidia support site https://www.nvidia.com/en-us/geforce/forums/user/1097591/462913// )
It appears to be relater to G-sync and the good news is it was ‘fixed’ for me by simply turning off Adaptive-Sync in the OSD just on my second monitor which I don’t use for gaming so it’s no serious loss.
I’m in contact with NVidia support and can post the ‘solutions’ they’ve suggested here if anyone would like but none of them have worked for me so far. I’ll also jump back on and post the real fix if NVidia finds one for me.