When the CSR said that the unit would have to be replaced, I ask him if they'd apply the price of a 600 to a 630 and he said no. I didn't force the issue at the time as I wasn't 100% sure that the 605 was toast.
I'll ask again when I call them. Nothing to lose I guess.
Maybe if I send them the 7 boxes I have laying around that I've decommissioned over the past 20 years they'd reconsider. LOL
You might want to indicate to the CSR that you require a unit with component outputs, ( say for a legacy TV?), which is why you decided on the 605 in the first place. The only current offering with component now is the 630.
Being a long time customer etc, you could consider chatting with the Loyalty department if you don't achieve success initially.
Could try a receiver refresh you can access it without having to talk to a rep but by calling the Shaw #. Could also just unplug the receiver power and plug it back in after a few seconds. It will run through its cycle and see if either of those restore the channels.
I agree with garywes as the first step. If the restart doesn't work, Shaw Direct may need to check what they list as your channels and fix what needs fixing. They may also ask to see what the receiver shows as signal strength and quality.
As bayguy said, maybe a tree or something in the path is reducing signal on a so-so aim of the dish.
As I recall, Shaw's automated phone service has an option to check to see if there is trouble with a particular channel.