Re: Diagnosis a problem (fret issue?)
Ok if I am reading you right you are having problems with only a single string?, if that is the case change your strings, they are cheap and its the easy way to cover several bases at once, when you change your strings use a pencil to lay a bit of graphite into the nut and bridge slots (for lube to keep the strings from binding) and check the slots for any obstructions or deforming, if there is a problem with the nut you can either have a pro make you a new one or use one of the many online sources to show you how to do it yourself. while you have the strings off check the tuners to see if the one that tunes your problem string is showing any abnormal movement or wear.
If none of the above fixes your problem then its time to take it to a pro.
If you want something that "barks" get a damn dog