Band issues with larger meetups

I run a weekly meetup and the rubber band seems to be dropping riders off the back lately and allowing the group to split, it also has been shooting riders off the front, When the band first came out it worked flawlessly now its causing so many issues on the ride, With us having to make numerous stops to regroup which is having a negative affect on the ride, Can someone please have a look at this?
regards dave

This is SO frustrating:

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