Somehow it only happends on Tsuru Reef always and sometimes on Eastwood. After respawn all starts to look "pixelated" and unsharp. I tried to low my graphics but it doesn't help so I guess its not a PC problem. I can play for an hour without respawn and everything fine but the moment I respawn the PS3-styled filter turned on. Any ideas why it happends and how to fix it?

Hey there,
That sounds very similar to a DLSS rendering issue other PC players have reported in the past.
Could you try the following?
When the image becomes pixelated, open Settings > Graphics.
Change DLSS from Quality to Balanced, apply the setting, and then change it back to Quality.
You can also try switching DLSS Off and back On.
For a more persistent workaround, test DLAA instead of DLSS.
If your GPU supports it, test DLAA or DLSS with Frame Generation enabled.
You can also try pressing Alt+Enter to switch display modes when the problem appears. This has reset the image for some players, although the issue may return after the next respawn.