Why did the controller lose the programs and parameters after Christmas shutdown?

kckku

The controller wouldn't startup on its own after the Christmas shutdown. I got a message on the Flexpendant that says the controller didn't shut down correctly. During the previous shutdown (can't remember when), the controller failed to correctly save this system data.

I had to restore the controller using a backup from before Christmas. Everything worked as is after this. The station and robot were able to home and start production.

I don't know why this happened or what I didn't do before going for Christmas vacation. I added the Flexpendant hotswap option before and maybe this had something to do with this? Otherwise, no changes were made to the controller.