LH430

Similar situation here today. On my way from LSZH - RKSI, (V 1.2.5) after 6h 15 into the flight just before the chinese border the plane got off the planned course. I tried to correct it with a "direct to" prompt but the FMS did not show any reaction. Tried to disconnect the AP, same result. All attempts to interact with any system of the plane were unsuccessful. I checked the course on Volanta and Navigraph charts and realized that the plane was flying a circle and realized that the chrono wasn´t running anymore. After all, I could not intervene in any way so all I could do was to exit MSFS24 and close another chapter of experience. Besides the usual WASM-Crashs (orange screens) and the usual additional tasks like calibrating the throttle etc. I never had any problems. I successfully completed short-, long- and ultrolong-hauls like WSSS-KEWR - this was a new one. Maybe somebody has made a similar experience and knows the cause of this and has a solution. Btw just FYI I use BATC und FSLTL and ACARS running in the background. Unfortunately no error log of this incident.