My account is blocked

Why does this happen every time I come in?, I've been playing the server for a long time, but I always get that

Its is just a part of anti-bots protection system, you shouldn't worry about it unless you using bots.
Otherwise just log website to unlock your account , then enjoy your game.

your solution doesn't works

I have the same. Usually logging in on the website fixes it, but not this time.

but for some reason only during friday and weekends, weird