Programmer here. This has been a problem for several years on Windows 8 and Windows 10, although the problem is not as bad under Windows 10, it still happens. This is a very difficult issue to track down that is why the author is asking you to try the dev version of the program, v5.0.7.
-- <https://forum.pspad.com/read.php?2,76327,76426> PSPad freeware editor https://www.pspad.com
