I was doing the LH715 from RJTT to EDDM, on the inibuilds A350-900 version 1.2.0, I have attached all of the auto save files of the aircraft and the simbrief OFP, I performed a std. preflight which included the FMS set up with a cpny flt. pln. request, followed by the departure, arrival, sec flight plan preperation, and the fix info and position monitor pages. The EO sid I entered was off of RJTT 16L to HNDX3 (RJTT16L/157/25) and hold followed by an immediate return to RJTT 16L with an ILS approach. Then I did the fuel and load, and to perf pages. I also imported all of the wind data and entered the T/C OAT and TROPO. I performed a successful pushback from RJTT stand 107, with gsx taxied out and then took off following the ROVER 4C off of 16L. I performed a successful Climb out up to fl350 and proceeded normally until about MARRC when I was playing around with OPT step climb function and ended up getting a more optimum stepclimb point for FL390 later in the flight, that was more optimum than what simbrief had calculated. After that, I stepped away from my PC and then the WASM crash occured within 5 minutes of me doing so.
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