Network errors are becoming more and more common as network devices are becoming more common in home installations. While in most cases these errors are not really a problem in everyday use, network HD video playback is particularly sensitive to such phenomena. The switchers and network routers are the most important links in the network and by investing in a quality brand you will be sure to be able to minimize this kind of problem. For your your switches, we advise you the D-Link brand.
Some network devices such as Sonos devices can create some network error and slow down the bitrate transfers. Please try to turn off all useless network devices and try again. If it works, turn on devices one by one and try again and again until you find the origin of the issue.