Screens die even though process is still running

I have a problem with running an irssi in a screen session on a tomato usb router setup. Screen reports session as dead, even though the process is still running (both for screen and irssi) Screen reports this There are screens on: 8387.pts-0.aum (Dead ???) 5331.pts-1.aum (Dead ???) And ps 5331 roman 1880 S {screen} SCREEN 5332 roman 1604 S /bin/sh 5334 roman 9492 S irssi Is there any way to fix this or at least to attach to a ghost session?