I found the answer here in the Community
Frustrating night last night with my L1 Model II with B1 having intermittent drop-outs. It finally stopped and I got through the 2 hour gig. But after the gig as I was sitting out in the audience visiting, I had music playing through the Bose and it started cutting out again.
This morning was spent troubleshooting the problem. First, check the Forum for any posts with the same problem. Found a post from ST, dated 11/9/17, Troubleshooting L1 Intermittent drop-outs. Which after reading jogged my memory about the time I had forgot to plug in my B1 to the power stand. And when I did the system did mute for a second. I went right to the speakon cable this morning. All 4 connections were loose on one end. The yellow slipped right out when i was inspecting it. The red one came out while I was putting the yellow back in. Needless to say I checked both my cables and tightened everything up. And was sooo thankful for ST's post. I Rocked out in my music room for a couple of hours and no drop-outs.
Edit Subject: Previously "Thank You ST"
Changed as per request from ST
Bose Pro Community Admin