I also have this problem. On some days the turn signal works perfectly whether doing a 'full' turn signal or a 'lane change' signal. On other days this problem is so bad that the turn signal is essentially non-functional. When I turn the signal on 'full' all I have to do is nudge the steering wheel (e.g. 0.5° rotation) and it turns off. It drives me nuts. I'll be bringing it in to the dealership very soon. Here's a video showing that all I have to do is nudge the steering wheel to turn off the signal:
That's how I'd describe the way the turn signals on my 2013 FFH behave as well. Do let us know if the dealer is able to find an issue. I haven't brought mine in for this yet as unfortunately (or fortunately, depending on how you look at it) the problem is so intermittent, that I don't expect the dealer to have any luck reproducing the problem. However, when it is acting up, I can be sitting in a turn lane at a red light, and have the signal turn off on its own. It will also turn off in the middle of a turn. And yes, I am aware of the "lane change" mode. I am making certain I am activating the turn signal all the way.
I also believe this is a problem that emerged as opposed to being a design flaw present from day one. The turn signals worked fine for the first several months. I'm hoping a TSB will emerge at some point.
Edited by c152driver, 13 June 2014 - 10:02 AM.