renault megane 2006 start up problem

Hello,

I have a 2006 renault megane with start up problems, the scanner showed both crank and cam shaft sensor , I changed the crank, after a month the same problem appeared the scanner was still showing the cam sensor , today at low rpm the car suddenly turned of and wont turn on, the technicians told me it might be one of 3 causes : the crankshaft sensor , the fuse board or the computer random faults , anyone having similar problems and might help? Tnx