L-NAV problem with the flight plan

[ThibaudBenjaminVandenhoven]

it's been a while i had stopped to fly the A310 due flight plan problem, when i'm at the gate making my cold&dark procedure, i enter the flight plan, everything looks good but for some reasons the autopilot seems working properly when suddenly a few minutes latter the lateral plan just not working any more just like L-NAV is dead, and the hdg is acting weird when activated... So is anyone have any idea or is me who not operate he aircraft properly?...🤔pls let me know Oh and btw it's doesn't change anything to deinstalled and reinstalled the game i had did it like 5 times...

[ThibaudBenjaminVandenhoven]

well i had make a new flight yesterday and now is working... sorry for the post