My second monitor, a HP W2082a, is connected to a 2070 Super via DVI to DisplayPort adapter. Occasionally the screen goes grey but it is still on and I can still drag windows and my mouse over to the monitor I just can't see it. The only fix that has worked for me is to unplug and replug in either the DisplayPort end (the monitor is DVI and the port on the 2070 Super is a DisplayPort) or the usb connected to the pc for it to come back. I believe the adapter is the BENFEI DisplayPort to DVI DVI-D Dual Link Adapter.
Specs:
Ryzen 7 5700X3D
Corsair Vengeance LPX DDR4 3200 C16 2x16GB
NVIDIA GeForce RTX 2070 Super
Main monitor: AOPEN by Acer 22CV1Q
Secondary monitor: HP W2082a
Specs:
Ryzen 7 5700X3D
Corsair Vengeance LPX DDR4 3200 C16 2x16GB
NVIDIA GeForce RTX 2070 Super
Main monitor: AOPEN by Acer 22CV1Q
Secondary monitor: HP W2082a