Okay folks, so after ranting about Apple on my previous post, which I will not remove for I still feel Apple's been slowly dropping the ball...
----------------------------I'VE FIXED THE ISSUE---------------------------
Yes it certainly is the docking port, and unless it is defective or damaged, a good cleaning with alcohol will solve your issue, BUT, what needs to be wiped with alcohol is not the white horizontal strip with the contacts. I tried this with no results and moved on to further inspect the port.
What needs cleaning are the two square, metal contacts that sit flush against the upper wall of the port. In other words, on the cavity wall that runs underneath the home button.
There are two square contacts on this wall just above the outer edges of the white plastic strip. The space between is very narrow and requires a very thin tool such as a tiny/thin flathead screwdriver, tip of a steak knife, or an exacto blade with a snapped tip, covered in an alcohol wipe or an alcohol soaked pec pad.
Wiping these two contacts down will leave a dark grey residue on the pad. This is metallic residue from your charging cable.
You can see similar residue when striking bare metal against light surfaces such as formica or porcelin. This residue is comprised of metal and is the reason why the contacts are fooled into beleiving your phone is still docked. This residue cannot be blown out in most cases, it must be wiped off.
Regular dust, which is all that can be blown out of the port, does not possess any conductive properties such as metal and therefore will not interfere in this way.
Try it, let me know if this works for you.