Technical stuff like unreadable translation cause I need to know what happens, and I’m not going to risk my brain to try and understand what’s going on. I’m also not fond of TL comments in the middle of chapters because it just throws me off when I’m focusing on the story. Also sometimes they’ll have legit conversations... As for novels themselves, if it’s boring to me. A lot of isekai are boring to me nowadays because they’re almost all the same (not all, in case I accidentally attract someone’s ire or something). Same with some villainess reincarnation/transmigration novels. Only a few bring anything new to the table, and a lot just feel like “Hey, I like this trend so I’ll write one as well” and it’s 99% the same as the other novels in its genre. I can usually hang on for a bit longer if the MC isn’t always dumb, but if they are... I drop it like a hot potato. Another are those that have the typical abusive, and cold CEO MLs that treat the MC like shit but then again, I never drop them because I never pick them up in the first place.