[SOLVED] FPS drop in DOTA 2

Nov 23, 2018
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my laptop is gigabyte sabre 15 with gtx 1060. At first I can play with ultra setting at constant 90-100 fps. but suddenly last month...my fps dropping and stay constant at 30fps.
I format and reinstall the windows its come back to 90+, now few weeks after that its dropping again to 30.
I never visit some shady website, everytime I played always close other program, always play with plugged in to power not on battery. my work only need me to open exel. so what is happen?

antivirus im using is windows 10 default antivirus. and other than dota... the only program still running that im aware is razer synapse and logitech gaming software