Throttling internet speed when streaming

I recently dropped Cox cable but kept Preferred internet. Right now I am at 18% usage and the last few days have noticed when I try to stream video my internet speed drops dramatically. I called tech support and checked speed and suddenly it was normal. My usual internet speed is 100+ mbps upload and 10+ mbps download. when streaming it drops to 10-15 mbps download and 3-5 mbps upload.

Could this be retaliation from Cox for dropping cable? Has anyone else experienced this situation?