Lag with low ping and high fps in CS GO?

Hey guys, I have been playing csgo for a while now with decent ping and high fps but lag that only occurs every once and a while. However, two days ago, every single game I was in, be it a comp match or just deathmatch, was laggy. It was the lag where the screen would freeze and then players would appear in a different position. This happens about every 7 to 8 seconds. My speedtest and ping test results are good, and my internet browsing and youtube buffering experience is great. What do you guys think is happening here?
Specs:
Intel i5-4690k
GeForce GTX 750 ti
8gbs ram
AS Rock Pro4 mother board
 
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