Check for interference (microwaves, cordless phones, neighbouring networks), make sure access points aren't hidden in cupboards or behind metal, and confirm you're not overloading one access point with too many devices. Split 2.4GHz and 5GHz sensibly, keep firmware updated, and reboot the router or access points on a schedule.
Coach's tip: one access point rarely covers a whole office — coverage problems are usually a design problem, not a broadband problem.
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