Apple TV slow wifi after continued use
I have a 3rd gen Apple TV that works fine for the most part. It connects to my wifi and I am able use it fine. Except after an about hour the wifi connection becomes so slow the ATV is unuseable. For example if I watching a TV show series, streamed from iTunes, I can watch the one episode from start to finish fine. When I go to play the next espisode, the wifi becomes so slow it can't load it. I get a spinning circle that says it will take 10+ hours to load and that I should change my picture quality to make it lower. I can back out to the iTunes store, and it will load icons, etc, albeit very slowly.
To fix this all I have to do is put the ATV to sleep and wake it back up and it works fine.
Multipe other wifi devices (many Apple products) all use this same router/signal with no issues at all. No router settings have changed.
The supposed recall my serial number comes close to matching but is one number off.
Any ideas?
Thanks
Apple TV (3rd generation)