Yep, it's 99% likely to be your turn signal stalk. My '05 WK is doing it as well. Apparently, it is a weak point and known problem. I haven't replaced mine yet, as the OEM part is somewhat pricey. You can probably find a newish one on ebay or a junk yard, as suggested. For me, it's more of an annoyance, and usually I can just fiddle with the stalk a bit (try pushing it in?) to make it go away. If/when it's a constant problem, I will probably have to replace the stalk. Until them, I'm just living with it.
Hope that helps.