Did you maybe have an electrical disturbance in the area?? Because that is a *lot* of electronic devices to stop working all at the same time.

Last summer at work some people doing work for cable hit a line and it caused a large (but quick) flash and a good disturbance. People for a 2 block radius had ovens, microwaves, phones, cellulars, tvs, etc all stop working randomly and we were liable to pay for all the replacements