Metal Halide color shift

Running a 250 Watt XM 10K bulb with a lumenarc reflector.
The last 2 days i noticed a flickering light shift in the bulb. The bulb gives off a slight yellow tinge, then for 1/2 seconds gives off a noticeable blue light. Previously the bulb was always the bluer color. The bulb is approx 6 months old running 12-14 hours per day.

Wondering if this is a problem with the bulb or ballast or possibly something else.

Ant thoughts?
 
The XM's did have an early history of this problem, and it still does show up from time to time. They usually have good product support, but not sure what would be done with 6 months gone by.
Joe
 
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