Randomly can't wake up repl

Problem description:
So, I am making my new web. I writed like 400 links of code, so it is very important for me (web took me like 5 hours to make). So, now I went outside and when I came back to code my web, it randomly sayed my repl can’t wake up.
There aren’t any rules that can this repl abuse, because there aren’t nothing NSFW or like it.
Maybe, is it because it’s running on subdomain of domain, which is used on another repl? (It’s my MC server domain, so I used subdomain for my web)?
Can I unlink domain, when I have no access to my repl? Please, help me! The web is very important for me.