Strange issue recently

I have been running the dude for years now. Recently I change a few things in my routing/switching. It seems that after this change if a site goes down the dude will not resume snmp until I restart the service. All I get is Interface.InBitRate and no Snmp. If I restart the dude, the site that was not showing any snmp will start working again.

Pings always work. Just snmp fails until restart of service.

Anyone else seen this issue.

I am running 3.6 but tried rolling to version 4 but still had the same issue.
dude.png

Anyone else have this issue? or know of a fix