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@Momentum
Sounds a little worrying. I don't think grease or lack of it would cause the problem.
Are the cranks themselves loose or just the bolts? If it's just the bolts then it may not be anything to worry about as sometimes the bolts loosen as the cranks work onto the tapers a bit further. Have you pulled the cranks off to see if there's any damage to them? Worth doing even if it gives you an unpleasant surprise. How much torque did you put in whn you installed the cranks? Cranks need a hell of a lot so they might be undertorqued. Maybe get Brixton Cycles to have a go with a torque wrench or buy one yourself?