All of the events in the device calendar on my Samsung Stratosphere mysteriously disappeared this past Saturday (Jan 6). The last time I remember using the calendar was to add a new event on Friday, Jan 5. When I tried to add another in the wee hours of Sunday, Jan 7, all existing events were gone. To (hopefully) improve the chances of recovery, I did *not* proceed to add anything. The only unusual activity in the interim was that I accidentally started the "My Verizon Mobile" app when I intended to load something else, and I killed it before it finished loading. Why did this wipe out my calendar, and how do I restore it?