My 2012 Sonic LT Sedan is making the clunking noise now as well. I drive 100+ highway miles everyday with no backroad driving. I am over 40K now. Not happy with this issue. I have not rec'd any recall notice for the suspension. I guess I should call the dealer or GM.
I have had the airbag recall, the w/w hose recall and [had an evap canister valve or selenoid go and the tech stripped mounting bolts so I had a loaner for a day as well. I hope this is not what I should expect in the future...
It's not a recall, recalls are technically Federally mandated, almost exclusively centered around a safety concern, and require the O.E.M. to attempt to contact the owner.
Things like the sway bar link fall under what is typically called a service bulletin. It is manufacturer initiated and does not require the O.E.M. to contact the owner (occasionally they will depending on the concern). Basically the company knows there's a recurring problem, releases a bulletin to the dealers/technicians informing them of the problem, causes, symptoms, and recommended repair.
If the customer comes in with symptoms associated with the bulletin the tech does a quick confirmation and then goes thru the warranty process, which is more straight forward on the tech side than other warranty repairs. Sometimes the techs are supposed to check for bulletin problems any time the car is brought in. It's also not uncommon for afflicted components to be given an extended warranty or serviced for free outside of the normal warranty period.
By all means set up an appointment and get the car checked out and try not to worry about it being a common trend. I'm certainly not worried about my car and have been relatively issue free for almost 40k miles, most of them extensively modified.