I generally change my grips once a season. Halfway through though, if you feel as if that 'stickiness' of the grip has gone, try physically cleaning the grips. I did this with my Golf Pride NDMC's on my wedges and they feel brand new. Hope this helps!
Definitely feel like this applies way too much to me lately. Having the worst hosel rocket problem on my chip shots and i just constantly find myself murmuring under my breath, **** me
. Don't get down on yourself tho. Practicimo practicimo practicimo!