I will say this has also been happening with Krita for me, was starting to randomly blame the core amount on my pc, nice (& not) to know it’s a bug that someone else has also been having issues with. I will be checking to see if the 5.1.4 doesn’t have the bug, & will check in later today to give an update on it. * Update * It isn’t bugging on 5.1.4, so there’s that.