Glad I stumbled onto this ,my 2010 does the same thing. Lights flicker at idle, radio cuts out if I hit the brakes or use the turn signal, sometimes. Also my door locks don't always work right and sometimes it glitches when it starts and throws coolant sensor codes. I was worried it might some wierd computer problem. From this is sounds like its just pretty much your basic electrical gremlins some cars seem to have. Which I hate, had I known it when I got the car I would not have bought it. Electrical problems are such a pain to find and fix. This has given me a few places to start though.
I was going to take it to the dealer, but the more I read about people doing this for these types of problems they just seem to get ripped off and never end up getting it fixed. I think maybe I will go get the charging system tested to start with. Then clean the battery terminals and start probing different spots with a meter. A .3 voltage drop made that big of a difference huh? I would have just overlooked that as normal. Mine really isn't doing anything that hinders how it drives. It is just kind of annoying is all. And I am kind of worried it might just quit running out of the blue.
Sad thing is I just bought it in august so I am stuck in the loan since I owe way more than the car is worth. Hopefully it will run for 3 or 4 years and I can trade it in on something different.