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when i type emails it takes forever because the letters get mixed up

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My cursor will shoot across the screen at random. Just now when I got to the word random the cursor jumped back to the word will.

It takes forever to compose a small email.

My cursor will shoot across the screen at random. Just now when I got to the word random the cursor jumped back to the word will. It takes forever to compose a small email.

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But you wrote this posting in your browser, not in Thunderbird, surely? So this problem occurs in at least two different places.

What is your Operating System?