At frequent random intervals. the keyboard becomes very slow to respond to keystrokes, with many double characters, which makes the product unintelligible and very difficult to edit. hp have replaced the original keyboard and mouse, which were Rev 1.1, with Rev 2.1, which seemed to work better for a few months, but is now just as bad as the original. Putting in new batteries (1.5v Duracell, but it's not much different with NimH's ) makes no difference.
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