johnny walker

i have a 2000 T/A WS6. 20K MILES. Went thru a problem once before where my car would not turn over, all the lights come on when the ignition was on but would not turn over, new battery, new starter, new clutch switch . still would not turn over, took the heat shield off starter because it looked like it had vibrated down & shorted against the starter connections. ran fine & started for awhile. took it out for awhile, would not start, waited awhile it started & got it home. hasn't started since. someone told me this is a security issue with a chip in the key. anyone out there been thru this.