Major Spikes

Alright so, my normal ping is like ~35, but I constantly spike to 350+ ping like every 2-3 mins..
Even if I only have CrossFire opened, it still spikes. It started happening since I got my new router like a month ago or so. (I didn't spike with the old one, but I needed to change it)
My PC is connected directly to the router via cable..

Does anyone know how to fix this :/

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