Need help with the Pak Utility Mod crashes

So my friend hosts the game and we both play together. We both downloaded the Pak Utility Mod a few days ago only to ease up the building process.

After playing with it for 10 hours or something, it started crashing the game. My friend can host the game using that mod and play just fine, but as soon as I connect to his server with the same mod the game crashes with an error on my client saying “Outgoing reliable buffer overflow”.

The mod is not life and death and I can still play without it but the building process is just too tedious specially if you are building vertically, which I always do. I need to build scaffolding like structures around to be able to move around the building and it is just too much time consuming. Also makes me forget at times what my building plan was.

Anyone here who has an idea as to how can I fix it? Or even better, can anyone suggest a different mod for flying which is multiplayer compatible?

We don’t use any other mods.

Thanks.