Interesting article I read last week, someone on Drone Chat just reminded me of it.
http://www.bbc.co.uk/news/technology-17119768
You can pick one of these up for about £30, and it could really ruin a day at the field.
I've not noticed any strange GPS behaviour yet, but after reading this article i feel a bit apprehensive every time I see a delivery van go down the road past my flying field.
However, there is also some good GPS news on the BBC at the moment.
10cm accuracy, even built up areas :D
http://news.bbc.co.uk/today/hi/today/newsid_9620000/9620148.stm
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Hope you can hold your breath until 2020.