Not Able to File Flight Plan after Pause

I was on a LongHaul flight and needed to disconnect for awhile. When logging back in I did the same as I always do and when I click Flight Plan instead of the Flight Plan Filed I get message. Call Sign In Use. You must be Stationery and on the ground. You can reconnect in 90 seconds. I’m not on the ground. I’m at FL 390. Any Help Appreciated. Eddie

Just refile before reconnecting, or quickly disconnect for refiling if already connected

Thanks Louis. I finally got it to go thru. Eddie