Dual Mining Problem

hii there,
is anyone facing problem in Dual Mining ?

i use to dual mine Ethereum plus Pascal fine but from 2-3 days i cant mine my pc shutsdown automatically after few minutes

temps are like 75c (mentioned temps b'cuz in case if someone thinks its due to overheat)

iam using windows 10 claymore 9.3 and tried latest 9.4 too same issue
driver = 16.9.1

mobo ga 990fxa ud3 r5
smps = corsair rm1000x (1000watts)
and five sapphire non plus RX 480 8gb(micron)

in dual mine
Eth= 128mh
pascal = 2100

dcri = 17