Could you please check the whether 'heartbeatInterval' attribute is set in /etc/sfcb/sfcb.cfg and if set what is the value?
Looking at a similar system here it doesn't look as though it's set at all. We haven't come across this in any other site, although we're doing things a bit differently with this customer and it's filling the alarm logs making it hard to see the main system problems. Have just read KB article 2020271 - I'll have a look when we're there and see how that goes.
Many thanks for a swift reply.