It sounds like you are in the correct place. I would definitely open a support case, if you haven't already, and let them take a look at everything.
(Submit a Ticket | SolarWinds Customer Portal )
You can check some simple/basic Kiwi diagnostics by clicking "Manage", then "Debug Options", then "Get diagnostic information".
The diagnostics will show you some basic stats for the server itself, top talkers, dns stats, static host entries, and various message stats. If you scroll down, towards the bottom half of the report, you should find some stats relating to message buffers. I would check those first, and see how if you have any overflow messages, and what percentage free is available. I have had numerous different issues cause the service to stop. While I have not performed the same actions you have, the last time I ran into this issue, I was simply adding a new rule. Another time, they narrowed it down to a database issue, as I had several rules dumping data into different tables in the same database.
What Kiwi version are you running?
How many rules do you have built?
Do you have any rules dumping data to a database?
How many message per hour does your indicator reach when it stops?
I wish I had more experience to offer you, but I'm pretty low level myself... Just trying to fill the void until the real help arrives.
Thank you,
-Will