On Wed, 7 Dec 2011 06:54:23 -0800 (PST), bob haller
wrote:

turned out a new building tenant who repaired 2 way business radios
was the cause. they upgraded shelding and the problem went away

One office, once had a Motorola radio & charger sitting next to a
computer. The drive would loose data - at least thought to be the
cause. In the same office they would open windows next to the
computer in the dead of winter all night -- what a crew.

And they lived in Pennsylvania...