After yet another crash my TiVo has stopped responding to any network connection. I cannot ping it, or ftp it or http it or even telnet to a bash prompt - nothing. Everything else is working ok and the little tivoweb module that shows the space used up in "now showing" is loading and running ok.
In fact it may be that module that is causing the problems because it is usually whilst on the "now showing" screen when the crashes occur.
I'll have t remove the drive and re-run nic_install to see if that restores a corrupt file.