Hello. I just completed Wayrest II. The boss however, didn't "die." People typed "ggwp" and a minute later I dc'd. I logged back in and it didn't give me any credit for killing the boss even though it was obvious that my teammates had.
Mudfish isn't preventing any disconnects from the ESO server, and I'm pretty sure I've determined the actual issue. It's a geographical issue. Vancouver has a lot of rain and wind. ESO really just doesn't work reliably in certain geographical locations, and other games like Fortnite or League of Legends are specifically designed to be playable even in the worst case scenarios. ESO is on the far other end where if an internet connection goes out for a single second - not even enough to stutter a YouTube video - you could end up being booted out of the server for 7 minutes
You could theoretically test it just by quickly disabling and reenabling internet and noting that it boots you from the server