This happen to me also. I already describe it somewhere on android forum, but this doesn't happen as often as android bug/freeze. It happens once in every 5 or 6 hours. I don't know if it also happen on other web browser, but I use chrome browser (updated). Internet speed is decent, it only take a sec or two to load the unity player. And as described before, the other tabs works well.
here's the screen shot of freeze'd game
zwzwa.jpg
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