That is not a lot of data to work with. This sounds like lack of signal, i.e. R510 is too far or is too obstructed. Here are general tips that you can follow:
- Put your WAP (Wireless Access Point) up high, preferably above head level or above furniture. That will help Wi-Fi signal go above furniture and other things.
- Place it horizontally parallel to the ground. Even though the WAP has dual-polarity, it works best placed horizontally.
- Put WAP closer to your TV
In order to better determine if this is the signal issue you can use the two methods below:
1. Run some internet speedtests with your phone behind your TV. Literally stick your phone behind there and run the test. You want to see at least 5 Mbps for comfortable streaming. You can use speedtest.net app for that (iPhone and Android stores have it)
2. Download some sort of signal meter app (Airport Utility for iPhone or WiFi Analyzer for Android) on your phone and measure the signal behind the TV using your phone. You want to see numbers between -45 and -70 dB. Anything lower than that would most likely be an issue. In the case of low signal follow the tips above.
Let us know if you can provide more data for more accurate diagnosis, like how far is R510 from the TV, where is it placed, what is in between the TV and the WAP (walls, mirrors, rooms).
Do you have access to the APs under the Lennar home installation? If the APs are in Solo/Standalone mode, they will choose the best 2.4 and 5g channels at the time they come up, based on a channel scan. If they are managed by a ZoneDirector or SmartZone controller, they feed environment info back to the controller, who's algorithms will update/change the AP channels/power as needed for optimum coverage.
If you have only one AP, distance and obstructions like Alex mentions are the keys to coverage. You don't want your AP mounted next to any electrical devices, AC/lighting, or on walls made of stucco with chickenwire underneath, as RF cannot pass through.
I suggest measure throughput from a device as things are now, reboot your AP, and test again with the same device from the same location, and did you see any difference/improvement? (if you don't have AP access, your client can tell what frequency/channel it's using before/after) Otherwise, is the AP in the "best" location? I hope this is helpful.