Might be a signal tone or something similar, I would look in your sound settings for anything new that might be checked
I found the source of the annoying new chime.
This is a cross post from another thread:
But, for anyone else who may have had an issue. I don't think it was the software update that CUT my battery life in half from prior (2-3 days)
From another thread, someone pointed me to sync services, which I had historically setup but hadn't done anything with in a while. and I didn't THINK anything would be setup without my confirmation, but it appears it was.
There were two new items in there, Skype and Tango which had sync services setup and running in some fashion. I disabled BOTH of them (so, sorry I can't tell you which was the culprit)
Now, I'm back to where I was before, phone is currently at 62% and 23:25 hours. (I did about 45 minutes of calls yesterday and a 1 hour gotomeeting session, plus about 20-30 emails)
Android OS now shows 9%, so something was running.
And, the stupid "do- dohh" sounds that had appeared is gone. Hasn't sounded in 24 hours at least. I THINK what happened was I USED skype to make a call. It was not running in the background, but I THINK that the sync services may have been checking for online status updates, or doing that sort of stuff the skype may do in the background. This could also be true of Tango, which as well was NOT running, but had somehow enabled sync services and was probably doing something similar.
So, if any of you have either of these two things running in sync services you might try disabling them, that did it for me.