Yes, I am using DX12.
Checked, and switching back to DX11 seems solving the problem. The only issue is, using DX12 was already a workaround as with DX11 if I am using Navigraph Charts in external browser then my Radeon GPU driver is crashing.
I just upgraded my old system, including the replacement of RTX2080S to an RX 7900 XT. With the Nvidia card I was using already DX12, but I had no such scenery issue. Can it be because of the AMD card/driver? 
I have purchased the new GPU just now, so I still have a month to test, worst case I can bring it back and decide to buy Nvidia if things are not improving, but I really want to give a chance to Radeon 