Hi,
this seems that for whatever reason, your indexer queues are blocked (either all the times or from time to time)
in that case, the indexer will shut down input port until the situation resolve
from your host, as the port is now closed, your splunk will try to reconnect. As the port is now closed, this is a very fast operation, which explain the small delay in internal logs.
So this is a consequence of your indexer(s) queue being blocked
you have to investigate until you find the root cause which could be many (more data arriving that you can handle, slow disks, busy cpus, configuration pb (ie for example if you have a loop !)
use of the Monitoring Console may help you in that case.
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