A310 FMS goes blank and plane crashes

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Are you using Developer Mode or made changes in it?

Yes and no.

Have you disabled/removed all your mods and addons?

no only have paid addons installed

Brief description of the issue:

descending using vnav profile mode after 10 hour flight deleted next waypoint coming up using CLR key in FPLAN. FMS goes blank and the plane starts to just nose dive and other FMS is frozen.

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Detailed steps to reproduce the issue encountered:

as above.

PC specs and/or peripheral set up if relevant:

not relevant using mouse.

Build Version # when you first started experiencing this issue:

40th anniversary.

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