'PHP Session - Limit of 1 session per IP

I have a mystery problem, many sessions are open for each unique IP putting items in my webshop cart. All was working good before ans suddenly without changind anything the cart does not update the quantity when the value change by the customers, so i think that it is due to the fact that i see in the session folder cache that many ID Session are activate for the same IP (like 15 session in 30 sec). Is there a way to limit in wordpress let say 1 session for a unique IP ? Or if you have an idea what code causing this cloning sessions in my theme. Thanks, JF



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