The behavior is abnormal. It sounds like there’s nothing to back up, but if there is I would back up your data, then load the prior 1.40 OS and see if the problem still persists. If you need a copy of the old OS send me a message and I’ll give it to you. Once you establish whether the problem is with your firmware or your machine, you can reload OS 1.50 and if the problem persists contact support by creating a ticket.
Also consider reporting this in the Digitakt bugs thread which I’ll find a link to.
here: