Did you try to reset the modem? This happened to me a few days ago and this worked.
Follow the reset procedure below:
1. Unplug the power cord of your Optik TV boxes and router/modem.
2. Wait one minute, then plug back in the modem's power cord and wait for the DSL and Internet and LED to be back online.
3. Plug in the PVR power cord, wait until it's fully rebooted and a channel is able to be viewed.
4. Reconnect any remaining boxes.