proxy disappers

Dear All,

I am using mikrotik router os 2.9.27 hotspot with external radius host. some times clients are able to login but browsing is not comming. after rebotting the router everything is ok. At that time i observed that
/ip proxy access print

METHOD DST-HOST DST-PORT PATH ACTION

0 ;;; block telnet & spam e-mail relaying
23-25 deny

This line is disappers. Please help me out to reslove the issue.

Thanks
babu

simply upgrade your RouterOS to newer version: http://wiki.mikrotik.com/wiki/Upgrading_RouterOS