My X2 overheats and then shuts down (Cool down mode). I'm an heavy user and its happening frequently.
I don't think this id from your use load, usually this happens do to a app that is carrying a heavier load on the system, try installing System Panel and allow the device to monitor the systems load to try to identify the problem app.
https://market.android.com/details?id=nextapp.systempanel&feature=search_result
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