Mh up and down !!

I'm running 3 rx 480 8Gb + 1 rx 470 4gb.

I'm using claymore and mine ETH only. ( 103~104 /s )

My pool mh/s always change between 80-120 mh/s.

Any way to fix it ??????

Green's my computer mh/s
Blue's ethermine.org report to me.