I have just installed the Deco S4 with 3 units. I have Verizon FIOS service with an Ethernet connection from the FIOS ONT to the base S4 unit on first floor. Second unit is in second floor hallway and third unit is in the third floor hallway. I have 300 Mbps service. By way of an Ethernet connection to the base unit, I get speeds around 280 Mbps on a MacBook Pro.. However, wifi speed 3 feet from base is only around 50 Mbps. Same on my iPhone 11, 50 Mbps. Second and third units get wifi speeds around 40. I know I'm not going to get 280 via wifi, but I thought I would get at least 100. I'm a novice and don't really know what to check or change to improve wifi speeds. Suggestions welcome. Thanks.
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Deco S4 Slow wifi
Model: Deco S4
Firmware Version: 1.4.3 20200918 Rel 77820