When I'm using Bridge cs6 it will work fine for like 20 minutes and then when using the arrows to scroll through pictures I will get an error sound. Then I won't be able to scroll anymore and continue to get an error sound if I click anything in bridge. This happens until I restart bridge and then it will work for about another 20 minutes before I get the same problem. I just upgraded to CS6 in September from CS4 because CS4 couldn't read my new camera's RAW files without converting them to DNGs.
The sound you get most likely is from an OS error or function that is being implemented. Don't think Bridge has any error sounds, but could be wrong.
When you are scrolling is the cache fully indexed? If not perhaps you are giving the processor too much work and its protests.
I have noticed with CS6 Bridge the whole system locks up until the cache if finished.
Yes the cache is fully indexed seems like its really random I'll go an hour with it working fine and sometimes I can get it to run for five mintues. Its just really tedious to constantly open and close bridge.