We have customized our home screen several times and added channels, but it keeps on resetting so we have to add the channels and sign in to each one all over again.
Generally speaking, this usually occurs when the flash memory in the device is failing. (hardware issue).
If you are currently using the TV USB for power, you can try using a power adapter at the wall. (5volt, 1amp cell phone charger). If currently using the wall adapter, can try using another one.
However, this symptom is usually indicative of a failing/failed device if the power supply is not determined to be the culprit..
If under a year, you should qualify for replacement under warranty. https://support.roku.com/article/208757058