No sound from galaxy note

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http://forum.xda-developers.com – I just received my galaxy note n7000 back from Samsung service centre after 2 months wait. However, I noticed the phone speaker does not work somehow. Yesterday, I was able to call and hear notification sounds for a while and then I lost all the sounds from the phone after few hours later. I decided to talk to samsung tech team but when I looked my phone again this morning, it worked perfectly. Everything worked again. However, now I don't hear anything from the phone again. I have no idea what is going on since it worked this morning. I wanted to ask you guys first since I seriously don't wa (HowTos)