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Usually the cause is poor WiFi connection with the Chromecast. Since everything is actually going over your WLAN to the Chromecast, it is important to have a strong signal. Turn the display, go to the Chromecast input and look for signal strength. If it is low and you still have your packaging, check to see if you have the short HDMI extension that came with it. Sometimes it can help you get a little stronger signal. If that doesn’t work you might have to move your wireless router - sometime just a foot or two difference or even rotating it can make a significant difference.