I honestly don't believe that simply typing on a keyboard can "cause" carpal tunnel syndrome.
Also, if you had a carpal tunnel release, it is highly unlikely that genuine CTS symptoms would come back, especially in a year. The CTS release is done by cutting the tendon that runs across the top of the carpal tunnel. If what you had was carpal tunnel syndrome, then the numbness should have gone away when the swelling from the release went down.
It is quite possible that the numbness in your hands emanating from your neck, or it could be some kind of tendonitis which is causing swelling in your wrists which is compressing the nerve in the carpal tunnel. But that is tendonitis and not CTS.
Probably the best thing you can do is to cut out salt, maybe take a mild natural diruetic or eat more Celery seed (and plant), Parsley, Dandelion, Juniper berries, Asparagus, Artichoke, Melon, and Watercress.
And take some mild anti inflammatory drug such as OTC Motrin.
If you rest your hand on the desk when you type, you could be irritating the nerve at the entrance to the carpal tunnel. Make sure you have your hands in the air when you type.
If you are at all overweight, then losing weight will almost invariably relieve most of the carpal tunnel symptoms.
The fact is that if the carpal tunnel release didn't work, then you probably didn't have carpal tunnel in the first place.
My ex-wife had carpal tunnel surgey in B’ham. She was cured! Would you like the name of the clinic?... I think she would talk to me to relay that data.