Did some more testing today. I had been using a PMDG 737-800 for a flight from KORD and KSTL and after going a little more than half way through it started happening. I must have tried 4 or 5 times. Today I tried with an Aerosoft CRJ700 and made the flight with no problems.I can't beleave PMDG would have a problem like this. Guess I'll have go into the PMDG forum and check it out
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Adam