RT-AC68U Wireless ping spikes

Hey, I play online games and I've been getting really bad ping spikes for a while and I can't figure out why. I don't get them all the time but they happen every now and again. I'm certain it's the wireless connection between my pc and my router as when I ping the router directly the ping spikes are present. Here is a screenshot of what it looks like:



This makes games unplayable when it happens and often I get auto-kicked for ping jitter.

I...

RT-AC68U Wireless ping spikes