I have 3 Roku TV's. All three tv's have just deleted channels 3 and 4. I have rescanned the channels several times, channel 3 and 4 do not program.
Channels now start at 6.1. Channel 4 is required as the one Satellite receiver broadcasts on that channel throughout the house.
I have channel 4 back at least. I went to settings, system, advanced system settings and selected "network connection reset".
I've been having the same problem to no real avail over the last couple of days too. In the four or five years we've had this TV, channels 3 and 4 on Live TV never disappeared until a couple of days ago and now I'm having an impossible time getting them back.