A couple of minutes after I start my engine, a 1 second beep occurs, all gages go dead (radio and lights work), and idiot lights alll fire. Maybe 10 - 20 minutes later, all go back on. Cycle then repeats. Anyone knowledgable on what problem is AND fix??

 

Welcome.

 

Welcome. Do some searching IIRC the 04-08's had problems with the gauge cluster. Maybe some of the post I linked might help you. Also check your grounds behind the r/s kick panel that is a common rust spot. Hope this helps.
08 F 150 XLT SC Instrument Cluster/Electrical Issue - Ford F150 Forum - Community of Ford Truck Fans
Instrument cluster gauges intermittently working - Ford F150 Forum - Community of Ford Truck Fans
05 F150 Instrument cluster and electrical issues - Ford F150 Forum - Community of Ford Truck Fans