Since upgrading my 2820vn to 3.3.4 the router has started "spontaneously" rebooting a couple of times a day.

I also not that the data flow monitor is showing clients having many more sessions than is reported by the client itself. The traffic graph shows 1000's of sessions - many more than the total from the data flow monitor (although I wonder if the former is an instantaneous count and the latter is the total over the refresh interval). Hard to be sure if there is a correlation yet, but the reboots appear to happen around the 10,000 sessions mark ("netstat -a -n" shows no computer with more than 20 or 30 connections, so I shouldn't have more than 100 connections, not 10,000!).

I would downgrade to 3.3.3 (where I didn't have the above problems), but I've just paid for a Web-Filter License .

I wondered if this was related to benji's comments
http://www.forum.draytek.co.uk/viewtopic.php?p=62708&highlight=#62708

Roll on 3.3.5 (assuming it gets better and not worse!).

If it's restarting on you, access the router's telnet interface and enter "sys ver dbg" which will show why it crashed. If you report that to draytek support then they should be able to help.

Thanks, useful command - I've done that & sent it:

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fimrware exception debug info

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EPC=80289910, Cause=00000001, Status=1000fc03, BadAddr=00000000, RetAddr=8019c2d4
exception id=0(INT: Normal Interrupt)
exception occured in IdleTask Timeout, task_id=161, SP=0x8080e574(11724 bytes free, 564 used bytes)
system tick =2080295
CURRENT_VERSION : 3.3.4_RC1
get from address : 80004000