I have been using the firebird server 1.5.1 using the event mechanism
(using isc_wait_for_event etc) happily for a year.
Recently we have created a few more applications that result in more
events being fired around the system. After about an hour of running
the event system seems to stop working. applications can still connect
to the database, run queries and update/insert records but every time I
try to post event the application does not seem to recieve it.
Is this a known issue and has it been resolved in later versions of
server (I am having problems downloading the release notes)?

If not, does anybody have any suggestions to resolve this issue?

Thanks in advance