I am on 1.40B and had something similar today.
Today I moved (not copied) some patterns from one bank B to bank C. I saved it, switched to another project and back to make sure it was saved. All fine!
Within the same project, I start recording samples in bank B. Created a pattern with the fresh kit and saved it.
Then, when sampling another kit, the DT locked up with a text “loading” and a constant tone! Nothing responded anymore and had to reboot the DT.
Turns out the pattern moves, project saves, saved samples and new patterns had all be disappeared! It was in the same state as I started today, even the removed pattern on bank B where back.
So I like to know what is going on.