shadow buffing bosses?

I had to take a break from PoE2 yesterday, after GGG kicked down my sandcastle for the 3rd time in a row. (crashed the servers and lost my map and waystone super juiced) yes I say servers b/c ever time i got d/c'd my friend who lives about 50miles away also d/c....and I come back today and suddently Xesht is unkillable, every time i get him low he stops taking dmg and starts insta casting and overlapping all his abilities? This isn't the first nor will it be the last time this team has made shadow changes w/o out telling anyone So no surprise i guess. Just kinda grinds my gears. Especially right after a sloppy patch roll out into a sat of non stop disconnects, with not an apology in sight. Now i have a boss ive killed at least 20 times on the hardest difficulty become unkillable to me. not sure who we are building the game for anymore cause it sure doesnt feel like its for the people who wanna acctually play it.