Cant get the fifth man into WoW

for a week or so everything worked great and I was running and completing dungeons.


Now when I get the 5th team member to finally log, I get disconnects so often I never have 5 people in party longer that one minute.

I deleted all the addons but innerspace.

Not sure what to try. Maybe I need to turn the graphics down on the slaves?
Operating System
Windows 10 Pro 64-bit
CPU
AMD FX-6300 31 °C
Vishera 32nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 937MHz (10-11-10-30)
Motherboard
Gigabyte Technology Co. Ltd. 970A-DS3P (CPU 1) 30 °C
Graphics
HF255 (1920x1080@60Hz)
2047MB NVIDIA GeForce GTX 750 Ti (EVGA) 31 °C
Storage
111GB KINGSTON SV300S37A120G (SATA-2 (SSD)) 31 °C
931GB Seagate ST1000DM003-1ER162 (SATA ) 31 °C
Optical Drives
HL-DT-ST DVD-RW GSA-H60L

Tweaked some things to easy the load on graphics card and I think CPU and its all working great again.
My fifth man is there and just getting disconnects every 15 min or so.
THanks.

I had a similar issue on a older intel 4770k with 16 gb ram. Was 5 boxing. In the end, after lot of tweaking, i upgraded to 32 gb ram and the random game shut down without any warning, stopped after that.