This happen when there are about 10+ cone lights around with shadow = true

The cone light has dynamic matrix update (flashlight) goes crazy whenever I point camera to the warehouse which has many cone lights there

https://streamable.com/zhpjm5

Even turning of the shadow of dynamic cone light does not help, the FPS of my game is OK as you can see in the video, it is kind of smooth most of time then I expect FPS does not affect the light/shadow. Things go crazier when I enter the warehouse

https://streamable.com/sr56sl

Please try updating to latest engine source code first, there were some possible workarounds for graphics bugs.
Let me know if you still have problem with latest source.

Today I have free time to get the source of engine and compile it then try. Sadly the cone light problem still persist

There's a very high chance that this is a bug in GPU Driver.