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I hate to go there, but could you be running into oil starvation problems. I haven't heard of any problems yet, but Subarus in general are know to have problems. If you have big sticky tires all the oil might be stuck in the head.
The cam timing is adjusted by oil pressure, so if it is starting to drop they may not adjust properly. I have no idea what the required pressure is vs when the sensor reports low pressure.
Of course you should also just plain make sure the oil is full.
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