@StephaneDupont have you tried turning off Unscheduled Automatic Power Save Delivery. is this the symbol of your clients having problems?

@guyd2 goto port configuration on the switch

@KuroPhoenix https://www.tp-link.com/en/support/download/tl-sx3016f/#Firmware

@LincolnMcCurry you set power saver on the access point properties, config and advanced

@guyd2 try forcing the port to 1000Mbps on the switch

@PiyushBQ you must first create a location group, then acl (access control) i'm not sure if you can use ip port group in stand alone but in controller mode you can, you almost have to try to see