I've been using the M1 for about 2 years now with no problems. Recently, when I am using Chromecast to watch on my TV and I change channels from my iphone or ipad, instead of changing channels my screen freezes and I get an "Unable to Stream" message.
I have reset my Slingbox and my Chromecast, my home wifi and the wifi at the location where the Chromecast is it. I've uninstalled and re-installed the Google Home (chromecast) app on both my ipad and my iphone. All to no avail.