S3L can't remember stereo links on Aux sends

Hi, I am having trouble with the Pairing of Aux sends on my S3L
Occasionally when I flip through my aux sends while in Flip mode I am missing an Aux, and it comes back when I switch to stereo/link and back.

Does someone else had this behavior before? Or knows a way to avoid it?

S3L can't remember stereo links on Aux sends