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Some owners of the Prime have reported random freezing issues after installing the ICS software update.
Although the company has several other bugs which they are working to fix, Asus' technical marketing overseer Gary Keys has confirmed that a fix for the freezing issue will be available in early February.
As the successor to one of the most popular tablets of it's time the Asus Eee Pad Transformer, the Prime had big shoes to fill. But even with it's slim design packing a quad core processor, the issues with Ice Cream Sandwich will surely cause potential customers to stay clear of the device. Asus needs to make sure their device is in 'prime' order before the Apple iPad 3 hits the market.
source - XDA-Developers