I've re-done the flight and I was able to replicate the issue.
I've selected the LAKL1T STAR in OOMS with ILS approach runway 08L via BUBIL
I've started the descent in V/L mode to be over BUBIL at 9000ft, just before BUBIL, reaching 10.000 ft I've applied the spoilers to reduce to 250knots.
This is the point, like the first flight where the freeze occurs (spoilers extended). systems, autopilot and FMS were completely unusable and unresponsive.
I hope this will help to finally solve this issue