It would be quite unusual for the brackets to break on an XB Remus exhaust. We have sold them for nearly 10 years and have had very very few warranty claims on these pipes for any reason, and none for broken brackets.
If it is something that keeps happening then it could be a vibration problem somewhere on the bike that is causing it rather than the exhaust itself (I once went through 3 exhaust link pipes on my old S3 before they found the problem was a hugely out of balance crank causing vibration that was breaking components all over the shop!).
Check to make sure that it correctly fitted and that the exhaust has no movement in it. Also that the chin spoiler is fitted tightly . Just because it was fitted at a dealer doesn't mean it was fitted properly