simple web proxy crashes after about ten seconds

RB2011UAS-2HnD
RouterOS 6.0
Windows 7 client

I am having trouble setting up the web proxy on my router. I have a very simple home network setup. a NAS, a few TVs and computers among housemates. I’ve set everything up according to the wiki http://wiki.mikrotik.com/wiki/Manual:IP/Proxy. the proxy works in normal or transparent mode, entries are added to the cache, pages get served to my computer or blocked according the tables. after about less than a minute the proxy crashes, i lose my internet connection but winbox stays open and i can remotely edit settings and reboot the router. if i disable the proxy and delete the mangle rule I won’t be able to access any web pages until i reset the router. so when i reboot everything works again but only for another ten seconds until i reboot. CPU cycles are under 10%, temperature is about 30C, 107mb of free ram.

Send supout file to support@mikrotik.com

i think you will re-setup your web-proxy in your Mikrotik. if you again face the same problem, please show your configuration.