iPhone Speaker Problem

I have an iPhone 5 with a speaker that is not working correctly. To get sound out of the speaker you have to press hard on the iPhone down in the right corner. (Where the speaker is located, watch the video)

What can the problem be?

Video: http://youtu.be/JXZK4Lhg3Ws

Jeff R said:

Obviously, a loose connection internally. Are the screws by the lightning connector loose by any chance?

Click to expand...

No, they are not loose.