The Japanese games company has acknowledged that the data required "an hour or more" to download and install.
In any case, any frozen machines should be covered by the Nintendo's standard 12-month warranty.
The Wii U launched in the US on Sunday and the first batch of the Wii U already became sold out at many stores. The device has completely sold out at GameStop stores worldwide, while Best Buy, Walmart and Target have very limited supplies, although stores may be holding back for Black Friday crowds.
The games console will launch in Europe in 30 November and 8 December in Japan.
Another significant update coming for the deivce next month, when Nintendo adds its TVii service.