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.