I randomly get kicked with different but kind of the same messages

Hello everyone,

very inconsistently, I get kicked from a server with almost different messages everytime, but they all start with "Internal Exception: io.netty.handler.codec.DecoderExeption".

Here are the ones I was able to do a screenshot because I mostly click them away asap:

• [see above] java.lang.RuntimeException: VarInt too big

• [...] com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformdJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $

• [...] ByteArray with size 8959 is bigger than allowed 2048

• [...] Badly compressed packet - size of X is below/above server threshold of 256

• [...] Badly compressed packet - size of 30255505 is larger than protocol maximum of 2097152

• [...] java.util.zip.DataFormatException: incorrect header check

• [...] java.util.zip.DataFormatException: invalid distance too far back

I do not use any texture packs or shaders and it doesn't matter if I play with Vanilla or with mods. On some servers, I get those kicks, on some server, I don't.

On one server, I had no problems in 1.16.1, but after an Update to 1.16.4, it started immediatly. I had those issues earlier on a 1.15 Vanilla server, but half a year before not a single problem like this.

I already reinstalled Windows and both Java and Minecraft, and no google results can help me. I already did the cmd ipconfig/flushdns thing, I already tried render distance of 2, nothing changed.

I am playing with wifi, but I do so since 2 years and there were no problems whatsoever, nothing change with my internet either. Can someone help me?