Like I suggested previously....lift the bike and turn the front wheel to a 45 degree angle to the left. Hold it in position then let go. It shouldn't drift from where you let go. If it moves, then do the quick adjustment (loosen head bolt/nut, then with a long screw driver and hammer, tap it (clock wise I believe) until the front wheel holds in place, then tighten the head bolt/nut.
First time I noticed mine being loose was coasting to a stop I took both hands off the grips at the same time for a moment (don't recall why) and the bike started into a wobble. Did the lift/test and tightened them up. Needs to be done occassionally.
If it is noticeable "notch" or as Saddlebum suggested front/back movement of the forks, then change the bearings. With your low mileage I don't believe it is your bearings or grease.
This is the link if you didn't already see it -
( @Freebird - pictures missing in this thread)