Dc in Dungeons

Dc in Dungeons
Hey I recently bought FINAL FANTASY XIV Online and have a huge problem I am starting to get dcs in Dungeons , first the Sound dissapers then the Movements of my character stops but at this point i can still play the game then the enemys dissapier and after a while the Game crushes "because of an Error the Game needed to be closed".I cant restart the game until it crushes and I cant use the task manger until it crusehes either. I dont have this problem in every Dungeon it started after I went into The Keeper of the Lake Dungeon and the Dungeons after that.
specs.
Prozessor Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz, 3201 MHz
RAM 8 GB
NVIDIA GeForce GTX 970
Windows 10
sry for the bad English.