Hello, i have the product HP ProBook 450 G2 Notebook PC and i face problem with microphone during my speaking through skype. Μy friend at the begining of the conversation can listen me very well and after 2 sec he can hear me with interruptions and sometimes not at all. I believe that every setting is correctly set up. As i put external microphone everyone can listen me very well. What is the problem? Is something that i have to update?