I keep getting disconected from the server, what should I do?

When I joined, I was playing trough tutorial when I suddenly got disconnected from the server. I rejoined the server and played for like 10 minutes going on first quest when I got disconnected again. I tried many times again to join but every time i got disconnected even when i go to the hub or even when i select the role. One of these disconnection loss said: Internal Exception: io.netty.handler.codec.DecoderException: java.lang.RuntimeException: VarLong too big. I got similar errors but I think its the same reason over and over again. I tried reinstalling my launcher first but that did not work too. Then I tried going to minecraft files and finding the files that were in error and reinstalling them too. That also did not work. After that i asked discord for help and I heard that I should refresh my router which also did not work, and I also tried using internet from my phone. That worked better but still after playing for 15 minutes it would disconnect me. I read on forum that there were some bugs and issues about people getting disconnected from the server because of remote host. Is this bug fixed or is it because of my computer? Do you know know how can I fix it or at least some methods that can reduce this disconnections or no?

 

What mc version are you using and any custom launchers/mods?

 

I´m using official mc launcher, 1.19.3 version with optifine and no mods.