I have a wired connection with a minimum speed of 56Mbps and have reset the router on numerous occasions, cleared the cache on the Xbox, given my Xbox a reserved IP address yet it just constantly buffers. I've had no problems with Netflix, Amazon or YouTube. If this can not be resolved I will have to cancel the subscription. The only temporary fix I've had is to close the app and relaunch it which gives me 5-10mins uninterrupted viewing