(Minecraft version: 1.8.9, there was no choice for this version in 'Affects Version/s')

First of all, I don't use any alts.

I created my account in June and I was able to log onto servers for a month. around 2 weeks ago, on a normal day(I forgot the date), when I tried to log in to server as usual, this error appeared. No server worked. I was using badlion client so I thought maybe it was causing the problem but vanilla launcher didn't work either. On top of that, I changed a device and still this error. Some other sites says to delete some lines in a 'hosts' file, but in my 'hosts' file those lines didn't exist.

The next day, the error fixed it self. Last Saturday, however, the error appeared again and on Sunday it didn't recover. On Monday it got fixed but on Wednesday it appeared again and it hasn't been able to fix it self since.

Please note that this issue is different from some that are already posted because it comes and goes instead of staying forever.