Glad to hear its not the other way round, "Engine cuts out when the Radio turns on" 
Frankly I'm surprised nobody has mentioned the ignition switch itself which can apparently cause all sorts of mayhem with the electronics and seems not to last that long.
Its an inexpensive and relatively easy fix as its just the electrical switch unit that needs to be replaced. I think its under $20 part.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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