Loosing ATC IFR flightplan at holding point

I create a flightplan with Littlenavmap. Export the flightplan into MSFS and PMDG. In the worldmap i load up the flightplan and start the flight at the ramp C&D. I file my IFR flightplan clearance: everything okay. I pushback and ask taxi clearance: still everything okay. During taxi i contact tower. And when i arrive at my holding point suddenly i have lost my IFR take off clearance and all that is left are VFR taxi to parking / gate options. Means i have to go back to the menu and start all over again: gone is one hour of preparation.
I also notice that Azure drops often lately. Yesterday i was flying with a friend online and he experienced the same with ATC (which was a very short flight but the same happenend)

Moved to ATC, Traffic & NAVAIDs as Bug Reports can only be for stock sim, no Third Party involvement (in this case Little Nav Map and more notably PMDG).

Also, when filing future Bug Reports per the above,please DO NOT delete Template. It’s there for a reason - to help the ingestion process so Dev Team can attempt a triage.