What do these bb errors indicate? They are happening quite often. Are we running out of some resource on the host?

nmsbb at pdcads04:/var/home/nmsbb/client/logs> cat h*log 2006-08-11 22:00:03 Write error while sending message to bbd at hobbit2:1984 2006-08-11 22:00:03 Whoops ! bb failed to send message - write error 2006-08-11 22:05:06 Write error while sending message to bbd at hobbit2:1984 2006-08-11 22:05:06 Whoops ! bb failed to send message - write error