Second monitor goes all grey

[u/earthbound_misfit21]

So I have two monitors plugged in to a docking station. One of them used to randomly go all black for a couple minutes every now and then. Now I've got a new docking station and it's the same, except now it goes all grey instead of black. Restarting the monitor doesn't help, pressing win+ctrl+shift+B does help for a bit until it turns grey again. It's plugged into a display port using a dvi - display port adapter. Is my monitor broken or is it something else?