Your sample actually flashed for me also using a W10 PC! I know how CP's work. Please try using another one as it is a variable. Please watch a full problem video with Subtitles in English with CP 1252 or CP1250 and check if it still occurs. Huuhh watching 2 hours subs in a language I don't even understand? You expect the Chines engineers to do so too isn't it? You need to exclude sources for that nasty problem as it is not repeatable and occurs randomly only for some. Yes, I don't exclude it is language specific. So please try English.