musical sound?

[Serengetti]

I was tracking a herd of reindeer at Hemmeldal and suddenly I heard a sound like a long (2 seconds) musical note or chord. Then all the tracks disappeared. I know the tracks disappear when the herd leaves the reserve, but was that music note some sort of message about that (or anything else)?

[calamar2000]

me too on several cards and I'm looking for a solution, maybe a sensitive ear?

[DanthemanBoone]

If you Guys have the on screen Display messages off you may be hearing the alert sounds for when you approach a lodge or place of interest. If that is the case you will hear the sound but not see the message explaining it.