What happened with my account

I have a really annoying problem. So my account logging out, so much already, and it's really bothering me. I just know why when the first time that if I didn't at least open the site tab for like 24 hours straight, so my account would like log out, right? So now I opened it like at least thrice everyday. But one day I forgot then my acc logging out BUT it says "you email or password is incorrect". How is that possible? I write my email and password the exact way I made it the first time? So, okay, I chabge the password and it's all good again. Now the problems is today, I was reading some manga like any other day, but ad suddenly popping up, and that's the cue that my acc suddenly logging out. WHY? I'm literally chilling here reading some comics?? Why my account suddenly logged out when I'M IN?? And again, when I tried logged in, it's says "your email or password is incorrect". Now I changed it again. Is there anyone have this kind of bad experience, I want to know why this keep happening