Sounds to me like Blizzard's anti-cheat program "Warden" strewed up and started auto banning/reporting people. This happened to me a few months ago on my main account right after the 2.2 patch. I hadn't installed any programs, mods or otherwise and got a ban the day after 2.2 came out. Luckily after a week of emails to Blizzard someone decided to investigate.
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