it may or may not be. If a light burns out, it will do the same thing. If there is a bad connection, it will do the same thing... You might just have a buld that is going on you or it could be any of the above, or the flasher. My left turn does the same thing from time to time, its 12 yrs old and does alot of funny stuff.....
if you like throwing parts at something with out looking at it first go ahead, I would at leat pull the bulbs and check and clean the connections first. If it was the flasher you would have problems with both sides so it could be it, dunno.....