Random FPS Drop

Looking for advice or any suggestions to resolve this issue I’ve been playing league for months without any issues with no changes to my setup however over the past couple of days I’ve started noticing a major drop in FPS randomly, mid-game, I would be playing fine at 120FPS and then all of a sudden out of nowhere I drop to 30FPS, Restarting League doesn’t resolve the issue, Dropping the video settings for very high to low, doesn’t change a thing The only way to resolve it is by restart my PC.

I’ve used the Hextech Repair tool, and reinstalled league, Updated Graphics drivers (Clean install) and OS updates (Possibly the issue, as I only recently upgrades to the latest version - Anyone else experienced issues with the latest Windows 10?), No Overclocking, Not noticing any high temperatures in the PC, Below is my setup

• I7-3700K
• 8GB Ram DDR3
• Liquid Cooling (corsair h100i v2)
• GTX 1080
• SSD HDD
• Windows 10 (Latest Version...Whatever it’s called nowadays)
• Power Options –High Performance Mode
• Graphics Card (Corsair Software) – Gaming Mode

Have been trying to monitor the system while gaming but can't seem to figure it out, anyone have any suggestions? [cass-cry]