Have you checked the settings of the wireless router or access point?
Change the wireless router or access point channels. When multiple wireless routers or access points are used, prevent radio frequency interference by setting far separated channels like "router A: Ch.1, router B: Ch.6, router C: Ch.11."
NOTE
On how to check or configure channel settings, see the instruction manuals for the wireless routers or access points, or contact the manufacturer.
If you can change the radio output power of your wireless router or access point, raise the output power.
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