I'm using Wifi-box.net Release Version: 2.02.2.6.tpr
I use MRTG and SNMP to monitor the traffic. With no
fault indications, SNMP just plain stops working. I
don't know enough to 'restart' the process, so I just
power off the router and magic, SNMP is working again.
I would say an average 3 to 4 weeks it stops working.