My controller cuts out sometimes, (only port one).

Occasionally, my controller will cut out on me. It used to simply cut in and then out, as if it had been unplugged and replugged quickly, sticking my analogues and shoulders in currently held positions. Now (still rarely) my controller will simply 'lock' and not allow me to do anything, unplugging and replugging has solved this thus far. It's probably an issue with the metal conductors in the individual port (or not, I don't know). Either way, I need some more permanent help.