SNMP updating problem

Hello. I use Dude v4.0.3b and I faced with some problems. Function device_perfomance() after some time automatically turns off and shows cpu 0% and this is all. It repairs only if I click apply in unit settings. How can I fix this? Many thanks.

Probably old bug, which isn’t solved yet because of… well, just read it
and leave your opinion there–> http://forum.mikrotik.com/t/the-dude-is-dead-move-on/56242/1