Nexus 4 Creaking Sounds near micro usb port

I noticed today that my nexus 4 creaks near the usb port when I tried a third party micro usb charger. I also noticed that his third party micro usb charger is hard to put in and take out which is strange since my galaxy s3 never had this problem. When I got home the phone creaked with and without the usb charger, even with lg's charger. Do you think this is a minor issue ?