I don't use the J-lock, and so it's not a problem, anymore.
Headed up to the range once and it was on, forgot the silly key. Ok, nobody else with a 700 was around so I waisted a trip. Now I keep a spare in the ammo box along with a dummy round, and when the 700 goes for a walk, so does the green key. Maybe that's a little ocd or just an annoying habit. Never had it lock on it's own either.