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Start with a pressure test for residual pressure. If your residual pressure does not hold, you will not have fuel in the system for a restart and the cold start valve will be inoperative due to the thermo time switch. If your residual pressure proves to be bad, the most like culprits, in order, are: fuel pump check valve, fuel accumulator, wur, fuel distributor pressure relief valve. Each can be tested to find which is at fault.

Simple test. When the no start occurs, remove the air cleaner, gently lift the plunger inside the intake (ignition key "on"), listen for the fuel pump running and the squeal of the injectors (do this only for 2-3 seconds.) If the car now starts, it's likely residual pressure.