molepacker

On three occassions in the last week my ISY-99Pro has reset the time for no apparent reason. It also seems to be changing my "custom" location as the times for sunrise and sunset are only minutes apart. I am in Florida where sunrise is around 7:AM and sunset around 6:30PM. After this reset the times will be something like 12:06AM and 12:12AM. The time is five or six hours off too. If I have ISY connect to the time server the correct time updates and the sunrise and sunset times are corrected. I am not aware of anything that has changed in my house recently. What could be causing this to occur.