105 front mech problem

Yeap, take it back to the shop.
They can investigate it and fingers crossed its just cable tension cuz that quicker than warranty!
Tiagra had a warranty issue - funny, we sent one back and got another faulty one in return!!! Pure coincidence! Wasn't aware of 105.
Bare in mind, it can take up to 2 weeks for Madison/Shimano to deem it as warranty, the shop will need to send the lever back and it just takes time.
I'm sure the shop will want to help in the best way possible.
Good luck!

It's just left the shop, possibly unfit for purpose.. they can supply a new one on sight and then deal with Shimano/importer behind the scenes. If they didn't I'd ask for a full refund and go elsewhere.