I don't think it's an issue due to certain factors. Firstly this device is (most likely) running with the screen on maximum brightness without going into standby. Next, by looking at the charging indicator light and the fact that it's connected to a power source, leads me to believe that it is discharging faster than the power source is able to replenish. That alone will cause the device to run hot without doing cpu intensive task. Throw in the usage of synthetic benchmarks (not sure how many times it was being ran) and it will start getting hot. One thing to note is that it appears that message dialog is generated from the Antutu application and not the system itself. Maybe Antutu has a threshold for CPU temps that differs from the host OS thermal monitor.
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