Roku Deletes scanned antenna channels while I am watching and turn off

I have a TCL ROKU 32 inch TV for my office ,The antenna scan function just does not work. as it should. It will not maintain the antenna channels once the TV is powered off.  It is very consistent.  This is a manufacturing defect or more likely a software defect that wipes the scan for any antenna channels once the power is turned off.  I have to rescan every time I time i turn on the TV in the morning  and when ever i turn it off during the day.  This is not operator error or i that don't know how to scan a channel it just a real and sever defect in this TV.  I would not recommend buying a TCL ROKU TV.  IT works fine for the normal netfllcks, disney prime apps just not for the antenna channels which i watch more than the other apps. I can believe they are unwilling to do a software fix for this issue.  Dont buy this product. unless you love to be frustrated on a daily basis.