Wow, must be a weird glitch. Just now I clicked start on the exact same settings I've been using that have failed after 1 attempt and it's doing the multi-battles normally.

You have some runs fail? Occassionally you get that crazy bad RNG and even "100%" teams can lose for some combo of events.

I used to have this issue on my earlier Fayne team. Had two different ways to get Drop Def and Weaken up, but still would ALL get resisted sometimes.

 Wow, lots of weird bugs today... I deleted this threaded shortly after my second post. :-)

 Nope, no fails during the events I described. Victories every time. It's been working normally now and I never changed any of my settings, truly a mystery.

 Personally I think Skavag has it in for me. I spent several thousand energy over the past couple weeks trying to get an accuracy banner for my Coffin Smasher so I can 2 key Nightmare Demon Lord and nothing. I finally got one today and it had speed as a substat! :-) It was a four star rare and it double rolled attack. :-(

 DJ RNG sums it up pretty well I think but beware, there are f-bombs. :-)

DJ RNG - RAID: Shadow Legends Rap (Player Diss) - YouTube 

This has been happening to me for a week or 10 days.  More so on iPad, but also on iPhone.  Multibattle kicks me out before the designated number of runs.  Most inconvienent when I set it and try to get some sleep and wake up with only a few runs.  Prior to a week or so ago I never had an issue.

Of 45 multibattle runs per day, this happens 3 or 4 times every day.

P.S. it's not a defeated type of situation, it just closes the app in the middle of a run.

Hmm. I thought it was just me