Its the Favorite Channels option in Settings/TV input/antenna.. uncheck the favorites option. I think it's a stupid feature. This is a good example of a smart TV doing a lot more than it should. The original posters follow-up post clears it up, that's how I fixed it.. disable the "favorite channels" option. Somebody visiting This thread might have a different issue but I had the same exact issue as the original person.
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For the issue where the signal goes in and out --> It could be that you have a USB plugged into back used for live tv pause feature. I used another USB stick I made sure to use the max TCL supports ( =>16GB) and you want to get a fast read/write speed, so just buy a USB 3.0 (32GB) stick. I say 32GB because although TCL supports maximum 16GB, when it's used by the TV it really is only using maybe 15.5, because of created partitions. So I say go with 32 GB so you get the full 16 they say they can support for Live TV. My problem was I was using a cheap old USB stick. They are not that expensive just make sure to get USB 3.0. Before spending money you can also take out your USB then insert to a computer, go into Computer or 'My Computer' in Windows 7, then right click the USB mass storage drive number that is for your USB and Format it in FAT32. This may not work, but if you're trying to save money it may be worth it. Once that is complete, take back to TV and see if issue persists. ***NOTE*** A Format will wipe out everything on your USB, and you'll want that because you'll want to give the Live TV all the space it can get to provide you with the full 90 mins of rewind time. If you want a USB to store pics and videos on to play on the TV, I suggest using another one just for that purpose.
I experienced both of these issues above. I did not have any signal issues related to antenna.
