You should be aware that these temp gages are "buffered". In other words, the gauge will stay in it's middle position even though the temp may vary by a significant amount. Therefore, you receive very little actual warning of an overheat condition and the gauge will return to a normal reading fairly soon.
Although I do not have an idea of what issue may be causing your problem, my guess is that you are experiencing a genuine overheat issue and should be cautious. Do you own an OBD II port reader to try to verify?
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