Haven't heard or seen anything, my guess is it's on your end, software or possible spamware, ect. Doubt a virus is going on, but check it. Many times sites will place crap in your PC telling you your under attack, getting a virus, ect, prompting you to use whatever program they have showing your problems, beware....Use a good free virus/spamware software like Avast.
So, I can't say, try rebooting your browser and see what happens
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