Hi,
the event generelly refers to workflows (rules, monitors, disocveries) failing and not being loaded. The exact description is:
"Summary: xxxx rule(s)/monitor(s) failed and got unloaded, 1 of them reached the failure limit that prevents automatic reload. Management group “xxx”. This is summary only event, please see other events with descriptions of unloaded rule(s)/monitor(s)."
In your case, sonsidering that the events do not contain the description in clear text, I assume it is:
"Summary: 15 rule(s)/monitor(s) failed and got unloaded, 1 of them reached the failure limit that prevents automatic reload. Management group “xxx”. This is summary only event, please see other events with descriptions of unloaded rule(s)/monitor(s)."
You need to identify what rules or monitors are exactly failing. For this purpose you need to find the other related events and do some debugging. Here is a nice giude on how to approach this:
Debugging SCOM Workflows using PowerShell
https://www.opslogix.com/knowledgebase/debugging-scom-workflows-using-powershell
*The event is also mentioned in this article.
this Social Technet Post can also give you some nice suggestions/ideas how to resolve this:
Event ID: 1103
https://social.technet.microsoft.com/Forums/en-US/88d6f386-162e-4217-be9c-87d53322961a/event-id-1103?forum=operationsmanagergeneral
I hope I could help you out.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Best regards,
Stoyan