Internet stalling every 5 mins. Suspect virus

I have a question actually.. my internet slows down every 5 mins… x: 03 08 13 18 23 28 33 38 and so on, on any hour any day. I have a feeling it’s a virus capturing data off my rig. I"m not freaked out , but i wanna know how to chase the problem without deleting and reinstalling my rig. And what i mean by slow down is i will get no bandwidth for that min… Youtube/imgur anything will stop in it’s tracks and go again at minutes later. Only programs that do enough precaching elude it… but if i’m watching any high end streaming it needs to catch up at those times. I’m more curious then frustrated how this is happening and where i can look to get rid of it. Fibe tv internet 500upload 500 download .