Model CU7000 tv does not retain favorite channels reverts to all channels

Model CU7000 50" TV. Overall good tv, but the problem is that edited / deleted Samsung TV plus channels show up about 2 days later. Over the air channels are fine, and deleted channels stay deleted. I have also setup favorites but same thing, 2 days later it deletes the favorites and reverts to showing ALL channels.
I have done a soft reset that samsung support suggested, unplugged connected devices while tv was on then unplugged tv for 1 min. It re detected the device, and then same problem, after initially saving the edits, 2 days later the edits are gone and deleted channels reappear.