After working out that my car had this, I seem to notice that I only get one flash at times.

I can not deliberately do one flash, but only seem to notice it when I am concentrating on something else. Maybe I go deaf when thinking?:rotz:

Nope , if you go a little bit too far with the stalk the system thinks you are switching them to the proper "on" position and then stops immediately afterwards.

Mine did that as well

+ if you hold it there it will flash for as long as you happen to hold it then stop as soon as you release.