Disable this. RivaTuner commonly causes this problem due to being outdated / caching. This is your GPU / drivers crashing and recovering. First, confirm it's still a problem without RivaTuner. When installing your GPU drivers, you want to clean install them and try different versions. Also update your motherboard's BIOS and run through any other system updates. The GPU could be starting to fail, in which case you could try a slight underclock to make it more stable. Thank you, so far uninstalling Riva tuner at least lets me start the game! I will do an extended test in WvW tonight and let you know if it also solved that issue. If not, I will go for a clean reinstall and a gpu underclock to see if that helps with anything. Will update soon, thank you so much.