Game frame spike freeze (around 0.1 sec) recently and character moving speed spikes before 1 min

Recently I found my LOL game play has video frame spike (around 0.1 sec), it happens all the time!!! Feels bad.

There is no lag in network, the connection shows 24 ms (no spike at all). The network does not has 'losing package' issue as I have confirmed with professional software.

There is no FPS issue but I do found spikes of FPS from 150 to 350, the lowest FPS is 150. Lowering video settings does not help. (I use intel 6700 + 16GB RAM+ Nvidia 1080, the game is stored in SSD)

I use a 144 Hz monitor and the frequency I used is 120 Hz. Changing it to 60 Hz does not help.

Open Nvida 3D synchronize+ in Game synchronize together or individually does not help.

Turn off anti-virus software does not help.

This issue is gone yesterday but came up today...

So now I really do not know what to do.