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Please provide more information. The only way we can help troubleshoot the issue is if you can figure out if there are specific actions that cause it to happen. Is it when you use a certain plane? Start from a certain location or fly the same route? Does it always happen after you've been using the program for a specific length of time? Also provide a copy of your log.txt. At the moment you have provided no information that can help recreate the issue.
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