Sometimes my Amazon firestick/prime video goes to crap as if my network connection was really bad. I hop on my google wifi gizmo and run a speed test and get 10

Sometimes my Amazon firestick/prime video goes to crap as if my network connection was really bad. I hop on my google wifi gizmo and run a speed test and get 100-200mbps down. Then sometimes the movie starts playing just fine. It's like they want to throttle my connection unless I'm looking.