All of a sudden (in last week) my 2820vn with 3352 firmware has gone very slow. Ping times even to ISP dns are over 300mSec instead of normal 30mSec. Rebooting, reloading firmware and repowering restore normal ping times for about 30 seconds before they go back to >300.
I get same ping times from PC or using the web diagnostic tool from the 2820.
Replaced the 2820vn with a Netgear and no problems.
searched forum but if there is anything I used wrong search words.
Any help appreciated.

There's a new firmware out - v3.3.7 which seems to fix a number of issues. It is available from www.draytek.com

As last resort i loaded latest firmware yesterday but fault is till there.