I'm inclined to agree regarding leaving well alone.Probably best to adopt the old adage fro the present, if it ain't broke, don't fix it.
It is infuriating, could be temperature related, certainly my area is much warmer today, if so in turn inferring lubrication related.
Or... point a fan heater at the hub for a couple of hours.A burst of warmer weather which at last seems to be in prospect could soften the grease enough to effect a permanent cure by redistributing it. A summer week of of over 30 degrees C would be ideal.