ADSL BR41 Firmware

Hi all, I am having problems with my ADSL BR41 router intermittently
loosing the connection to the internet (cant browse web pages, but email
still works).
My first thoughts is that it may be a bug, and a firmware upgrade may fix it
if available.

I am running version 2.3d.

Does anyone know where I could get the latest firmware (if available), or
has anyone had similar problems and possibly a solution.

Hope somebody can be of assistance.

Thanks
Allan