Scary noise

[tpatton]

My S.E.X. is driving Oris 150 horns, and yesterday when I turned the system on, I hadn't even gotten back to my listening position before there was horrible noise, like a science fiction movie firefight with electronic weapons: jagged, mid and high frequencies, loud!  After turning the system off ASAP, I brought in my wife to sit centrally and see if there was any L/R difference, and turned the system back on.  It acted 100% normal, so I proceeded to play an LP side and then turned it off.  I'd love to know what went on, and especially whether I can do something to keep it from happening again.  Any help/advice will be appreciated.

[Caucasian Blackplate]

This kind of sounds like cell phone interference.