After effects

Few Months Ago everything was working fine in after effects , it was using my gpu and performance was very good but all of a sudden one day it stopped using my gpu and renders that used to complete in 15 mins are now taking 5 -4 hours and sometimes crashing in between , i have literally tried every possible fix on the internet . disabled integrated gpu, updated drivers , set up graphics setting for highest performance nothing is working , please help , it was working few months ago , now i dont know what happened .