It could well be your brake check function on the KDL16L I’ve had the same problem, the KDL checks the brake pods individually, and if one is not holding, it can jump onto the final limit, you can set this to check every 5 mins to see if it’s that! Menu 6-30 & set to 2, then watch lift at top floor, turn landing calls off first, it seems like she’s to wait.
It will probably be set to 6-30-1 that’s once a day, let us know how you get on

Dave