Battery Bank USB Female port HARDLY has any connection with the USB

So last year I got this Battery Bank from Spire for my phone and it worked fine for 2-3 months then one day I started to notice I had to apply pressure with my USB under certain angle so the USB would get contact with it and start charging my phone.

I tried looking if there was any dust and cleared out what was there, tried 3 different USB cables but still no help.

So I'm turning to you guys hoping that you can point me into the right direction at least.

Thank you in advance!!!

Here are 2 close-ups images:

http://imgur.com/TUCmmO1

http://imgur.com/O4eY42Y

And this is how I have to apply pressure (almost really hard) to have ANY contact and start charging):

http://imgur.com/jqZcXPf