One of three things.
Resistor in the Key is getting bad. If you did not get a new one recently try that.
two.
VAT which people actually think is the resistor in the key. The key is only part of the VAT. the next time your car won't start lock the doors. and unlock the passenger door using your key. What may be happening is that your unlock sensor on you drivers door needs to be adjusted.
Third.
Do you have a manual transmission. Your clutch switch may be going bad.
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Robert J. DeMarco
1998 Pacecar Original Owner Stock
1993 Callaway Ruby Red ZR-1 #219
1991 Callaway Aerobody ZR-1 #1026 Purple Pearl Mist
1991 Shinoda Aerobody ZR-1 #1696 (Under Construction)
2003 50th Anniversary Roadster Pacecar
1990 LPE ZR-1
ZR-1 Registry Member #1393
NCM Lifetime Member #2551
Pacecar Registry Member
Grand Sport Registry Lifetime Member