@EA_Leeuw Yeah, it's done it over multiple different firmwares.
I noticed it after a game patch. That's when it started. So I just assumed it was a game issue.
I tried everything, updated all bios, chipset, gpu, cpu etc etc. Reinstalling the game.
A friend said to try tethering my mobile data, and play on that. I did, and got no fps drops.
So that lead me to thinking it was my ISP. Last thing I tried was removing the decos, and that fixed it.
Like I said, I can reproduce the fault by refitting the Decos.
It's very odd, doesnt really make sense. But I don't really know about TN etc. I m just happy I have a fix for me at least 🙂