DCS-6620 locks up and will not Pan and Tilt

I have a DCS-6620 that is about a year old. Lately I find that the camera locks up and refuses to move although it continues to otherwise function. I can not move the camera, zoom or focus the camera remotely. This usually happens on a windy day when the camera gets blown around a bit. I have it outdoors in the DCS-70 outdoor enclosure. Sometimes I can get it to reset itself by going into the web configuration menu under tools/default and selecting the button to recalibrate at the bottom. Even if it does not work immediately, the camera usually self corrects by the next day and the problem repeats itsself. The camers is remorte so it is difficult to try to do a physical reset. It would appear that the camera is loosing its location registration information. Any thoughts?