By Mitch P

shocks have a certain range of travel they like to work in. Once you lower your vehicle via adjusting the air ride height, or with springs, you are supposed to change out the shocks to match the lower range of motion. You're now using shocks intended to operate in the stock height settings at a much different range - this will kill them from what I know. You absolutely must change out the shocks at the same time of a suspention lowering for two reasons:

1) they aren't in their optimal range anymore as stated above,
2) you were already there in the first place labor wise. Some save money by not buying shocks - that's the short term. The long term is that they will wear out faster and you'll have to go back in and change them out. You end up spending twice for labor - best thing to do is change them out when the suspension is going in the first place.

All of the above is just from my own tuning experience, but I bet it's what you're experiencing. Check for fluid around the shock body and once they are out, check how well they operate - they are most likely dead. G'luck!
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Mike F
Current: 2017 Grand Cherokee HEMI
2017 Kawasaki ZX-14r
2017 Harley RG Ultra
2017 Harley Fatboy S