The excitement around Amazon's (AMZN) Kindle Fire release has been dampened by a number of user complaints, and Wednesday the company unveiled some fixes.

Amazon has issued a free software update that "enhances fluidity and performance." The update is also supposed to improve the tablet's touchscreen after complaints that the screen was slow to respond.

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Perhaps most important, Amazon now allows users to choose which items display on the Kindle Fire's carousel. That should quiet some griping. The update should appear automatically.

The company didn't address every problem, however, and some -- like no physical volume control buttons and an off switch that's too easy to flip -- will remain until the hardware gets upgraded.

For more complaints with the Fire, see usability expert Jakob Nielsen's recent writeup, in which he calls the device "a disappointingly poor user experience."

But credit Amazon for moving quickly to address some problems. The update shows the company is responsive and willing to get fixes out when it can.

Amazon said it sold 1 million Kindles a week for three weeks in late November and December. The company wouldn't specify how many were the $199 Kindle Fire -- there are three other Kindle versions as well -- but it did say the Fire has been its best-selling product for 11 straight weeks.