Lag starting with most recent patch

[Moberly]

similar probs on my end, i run a 43" 4k, desktop set at 3840x, game set at 1920x, my prob is wont stay in full screen mode. Screen also flashes now and then when its getting ready to drop back into windowed mode. Yesterday game ran good all day, in evening wasnt able to get back in after supper, kept getting memory application errors, thinking might have been over loaded network problems. Today got in no prob but still wont stay in full screen mode. Windowed mode is too small for me to play in.