There are more issues here than the Pavlov's dog reactions in previous posts.
Crews should be 'on the ball' and aware that 'comms' are not normal eg other a/c are getting vectors to places outside your area/ground TX is getting weak/you haven't been called when you expected a freq change - all these require an awareness which I think fades in the glass cockpit environment. Then, any of these 'triggers' calls for a monitor of 121.5. - not to listen ALL the time regardless, as we know that is painful, but 121.5 is where you will be called if you are 'lost'. They also call for the old chart to be looked at for a suitable frequency - "WHAT! - I never need to do that - I've got LNAV". It's that old 'airmanship' thing again. Sorry.
I suspect 121.5 would have been busy for many minutes calling SAS. At least they probably selected it when the Tiffy arrived alongside.