Originally Posted by kerry

Search the forum and you'll find a fair amount on this topic. One problem can be dirty contacts in the ignition switch and there's a thread describing how to clean them. Some people have added a solenoid relay in the circuit to increase voltage to the starter to solve this problem.
It's pretty common on the 123's. I carry a jumper wire in my TD because it does it every few months for 3 or 4 times, then clears up.