Guild Wars 2

It is so annoying when I’m fighting a boss (Veteran/Champion) and I’m slowly but surely getting him killed when out of nowhere a totally random mob spawns and throws me off and I end up dying.

Please, please, please implement something that, I don’t know, disables respawn for enemies around you while you’re still fighting!

That’s part of the challenge of PvE. You have to deal with the environment.