I doubt it is a HDCP issue as the Wii has no need for it. I think you may want to a hard shut down, not just the standby button and unplug it for a few minutes, if that doesn't work I would try the latest firmware update for the 3808 to see if it helps. I have had some settings go a little crazy after playing around and the system became unresponsive to any changes till I did the hard power off.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70