Whilst SRAM is a lot more agriculture in it's engineering than Shimano, it means an amatuer mechanic can actually work on them. The ratchets inside the shifter are fairly straightforward to remove and clean and SRAM actually recommends you do that on a regular basis.
Is the bike with you or the bike shop? maybe have a go at removing the ratchet and giving it a clean and inspection. See what state state it's in and if there is indeed noticeable wear. There's some really good tech docs on SRAMs website as well detailing all of the innards of these things.
Frustratingly, despite the aforementioned simplicity of maintenance/inspection, SRAM are notoriously bad at providing simple spare parts so you can fix things, hey why help the planet out when you can simply flog more stuff!
Whilst SRAM don't sell parts,
Ratio Technology manufacturer some parts, however, they don't currently offer a 11 speed ratchet, instead they sell a 12 speed ratchet to upgrade your existing shifter. Might be worth dropping an email though to see if they do have ideas for replacing a 11 speed ratchet.