Yeah, I'm using a G4 I got at the first of the year. no issues receiving at all. From where I live, I primarily pick up the tower on Fox Pass, but did make a trip to LR recently and threw it in. Radio switched to the Magnet Tower as I got into Saline County and didn't miss a beat.
Not sure why yours is having an issue. I used the import RR data option in the programming software. I decided to have it import all the primary and alternate control channels in the State, just in case I decided to take it with me when traveling. Importing from the RR database really made it simple and painless. If you have that option, you might try downloading the data and uploading it, just in case something has changed from the way yours is currently programmed.