There are a couple of things you could try... 1. Unplug the unit overnight. 2. Try forcing another software download (reboot the unit, and when the blue lights come back on on the front panel, press 0-2-4-6-8 on the remote control)...
If both of those fail, I'm afraid the next step would be to do a 'reset everything'... and then if that doesn't work... calling for a replacement...
If both of those fail, I'm afraid the next step would be to do a 'reset everything'... and then if that doesn't work... calling for a replacement...