Just got my Tab last weekend and I get this message after using Chromecast everytime after watching a few youtube videos. Saw a post over on XDA about it that its happening to others, so I wrote Samsung Tech Support. Got the usual canned answer, but at least they get another complaint about it.
"Your tab doesn't support Chrome cast. We do not have any tested information with the third party accessories. In order to isolate the issue with the tab, please perform the hard reset on the device. Performing a hard data reset will clear the tablet’s memory and put the device back to the original factory default state."
"Your tab doesn't support Chrome cast. We do not have any tested information with the third party accessories. In order to isolate the issue with the tab, please perform the hard reset on the device. Performing a hard data reset will clear the tablet’s memory and put the device back to the original factory default state."