Sig Null

I'm using an iPhone 5 as a "remote head" for the 536 (in Access Point) in my vehicle.

At first I would occasionally see "Sig Null" briefly pop up on the iPhone, then the data display would resume.

It seems that over the past couple of weeks, the "Sig Null" is showing up much more often and lingering longer, than it used to.

Is anyone else noticing this?

I had the same issue on a 4. Shut down the phone an restart. You should see a huge improvement.