Mine keeps doing it. At first it (3 months ago) was just a periodic shallow numbness but not it's deep as fuck it's starting to become painful. I've lost no mobility in it and I could still run a mile in under 10 minutes. It's just starting to become worrying, because I could stab myself and not feel the slightest. I just sunk in a 2 inch needle and didn't feel it at all. If I wasn't looking, I wouldn't know I'd done it. I say diabetes, because I was wrongly diagnosed with it earlier in the year and one question they kept asking was if I got localised numbness. Going to the doctors is a last resort. I'm tired of stripping for his pleasure.