is it sticking when using the key? or sticking using the keyless entry? if its when using the key try a squirt of WD40 in the key hole that usually frees things up in there. if thats not it then ya might have to open up the panel and lubricate the linkages. worst case the lock solenoid could be goin bad and intermitenly working.
I have had this problem too, I am attribuiting it to the extreme cold. On the warmer days 15*+ I have not had problems. I have not tried the wd-40 although I have just moved, so I don't know which box it is in.
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