It seems according to the monitor its either try restarting the monitor or reboot the QNAP. I am not using observium but my monitor had to be restarted to stop the flapping just a suggestion

On Wed, Jul 25, 2018, 6:55 AM Basile Bluntschli <basile.bluntschli@gmail.com> wrote:

Hi All

after upgrading a QNAP Device from 4.3.3 to 4.3.4 SNMP works every second poll.
Event Log is full with things like:
2018-07-25 12:40:02 nas01 Device status changed to Up
2018-07-25 12:35:08 nas01 Device status changed to Down (snmp)

How can I further troubleshoot this?

It used to work before for more than a year.

Thanks
Basile

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