Shimano deore LX crankset

Ive had my LX crankset for just under a year now and its been gerat up until recently. The problem is that the left crank keeps sliding. Ive Taken it all apart and degerased it all and it still slips. The splineing is still in good condition as well.
Any advice?
Matt
Any advice?
Matt
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Parktools :?:SheldonBrown