No crank no start

Car has been towed to Ford 5 times for starting
issues since May and loss of all power while
driving.  Replaced instrument cluster.  Next day will
not start.  Brought it back, now it's a clutch issue
and clutch packs and computer replaced per class
action.  Get it home, car won't start.  Let it sit all
weekend as everytime I go to have it towed, it
starts.  Ford cannot duplicate so we were sent
home for the 5th time.  Get it home.  Won't
start..no sound, all interior chimes and lights on.  
Switched relays, jiggled keys to see if it was
ignition switch.  Nothing!!  Everytime ford has the
car, it starts fine.  Help!!!!