Very strange sound problem with MT3

 
Hi,

Yesterday, while I had an opened trade manually opened, I heard for the first time the sound expert.wav, first once from time to time then like crazy as the volatility was increasing on all the pairs.

I checked the following points (while still listening the sound) :
- I had no expert advisors assigned to the opened charts (anyway I never used expert advisors in MT3)
- I had no special entries in the journal
- The table of events was assigning expert.wav to only "expert advisor"

Thank you for your help