A job always gets stuck

I have a daily job that has always worked fine. It’s a job of local files to a cloud destination (mega.nz).
Unfortunately it’s some weeks that it gets stuck every day.
I’m forced to kill duplicati process (on my win 8.1 pc) and run it again. After that, the job starts immediately (since it is scheduled to run daily, and the system recognizes that it’s been more than 24 hours since the last run), it completed with no error, but at the next run it get stuck. And so, forever. The most annoying thing is that getting stuck it prevents all other scheduled jobs to tun properly…
I don’t know what to do.

I recommend opening a browser tab to Duplicati web UI, going to About -> Show Log -> Live, and set the dropdown to Verbose. Leave this tab open here.

The next time Duplicati appears to hang at the end of the job, go to this tab and look at the most recent lines. It can help provide a clue as to the problem.