There is a TSB on this (#15219) and if memory serves me right when I inquired about my truck doing this, was told that it was just a normal self diagnostic check of the gauges and not to worry. It hasn't happened since I replaced the instrument cluster because of intermittent display problems so personally I'm not sure if the two are related or not. Try doing a site search ( right hand side of screen) on this topic as it has been mention before and maybe some one has more info on this. Hope this helps.
Actually, it's a sign that the PCM is not receiving enough voltage from the truck's battery to retain it's settings after the truck has been turned off for awhile. 99% of the time, a weak battery is the cause.