Mine froze going in and out of the Mii channel and sometimes the Wii shop channel.
I called Nintendo service and they offered an exchange by next day shipping, but I declined due to the serial number of the replacement unit not matching my receipt with the extended warranty.
I ended up returning it.
BTW, I picked up Zelda Twilight Princess for GameCube and have logged 33+ hours so far. 3/4 twilight mirrors.