Default [RESOLVED] Nexus 5 always beeping when unlocked

Dear xda gourous,
Today my nexus5 decided to tilt every time I unlock it or when I shake it...*
Did anybody face same issue? How could I stop this "tututulu"

I just attached the sound to my drive:
https://docs.google.com/file/d/0B3eC...p=docslist_api


Thanks !

-- linked to NFC +android beam
PHONES
HTC Desire with MIUI JB
Samsung Galaxy S2 with JellyBam
Nexus 5 with basic rom

TABLET
Acer A500 with *CM10.1 from TegraOwners
Asus Tf701