Invalid name/pass (played for 3 days)

[Grock]

So today my game just randomly closed without any messages and since then launcher now says my username/password are incorrect.

I searched around the forum, but i couldn't find any instructions as to what to do.

I did not change password or anything. My name/pass only consist of a-z/0-9. It worked with no issues for 3 days and im not sure if my game has ever crashed.
Server was running perfectly fine at the moment, as it seems. It was 800 players online when i crashed and it grew up to 1k+ over next couple of hours, so other people had no trouble getting in(thus 'data server' was probably ok?).

Did i just got banned/blocked? (but i can access the forum and there's nothing in my mail)
If you have some anti-cheat could it react like this to lags and spikes? Cause i had some pretty weird lag/spikes i just like 20 minutes before i got kicked out. I am from Russia and other players reported (in the past) that some of our IPs/networks are banned on your server, is this the case? What is the workaround then?

[Grock]

Okay looks like i found part the problem.

For some reason after three days of playing with "Remembered" username and password my launcher decided to forget last 3 symbols, after typing the password manually it worked. Though it happened just now, but im pretty sure i DID re-type the password yesterday.

Still leaves the question why game crash and launcher bug happened both at same moment.