I have a Chromecast and it worked fine. Then I got a new modem and it now works like crap. The sound and images are not synced and it is very stuttery. Unwatchable. I checked that the modem was on 2.4, not 5, and I also made sure it is set to a less busy channel. No improvement. It works great for YouTube, but I want to stream TV shows from other websites, and that is where the issue lies. I read that is a common problem. Any suggestions? TIA.