Memory Totally Wiped Out

Anyone else experienced this??

I had a backup from 2 days ago so not much was losst, but damn what a shock to boot up the Z and find all my patterns gone. Has anyone else had this experience? All projects reset to empty out of the blue. I didnt leave it on for an outrageous amount of time, hadn’t connected it to the computer between the time it was fine and the time it was reset… I’m at a bit of a loss as to what caused it, and am pretty good about backing things up, but it has shaken my faith in this device to be reliable enough to make the centerpiece to my studio…