What do you use for Internet and is the hopper connected to your wifi?
There are known issues with some Comcast, Mediacom and AT&T Gateways and also with MiFi Hotspots. The immediate fix is to disable bridging - Press menu til you get to the diagnostic screen, press 2 for network, select internet settngs, the the Advanced tab on top, turn bridging off. Of course, this disables internet capable options at the Joeys. Or if you have one of the problematic gateways, a Hopper Internet Connector (probably want a tech for that) or a 3rd party router designated just for the Hopper will fix it