Wireless is like that. You think you buy your current antenna so big already, still disconnect.
What you should be doing if you have lots of old parts lying around, which you should from years of ISP recontracting:
1) Go wired LAN for as much as possible
2) Draw up your route for the wired LAN, identify places where you cannot use wired LAN, and where you need switches. Gigabit switches are $10-20 today and they don't disconnect, and you can even use old wifi routers for the job.
3) Now you may have identified two or more different areas which cannot be connected by wired LAN. Maybe there's a wall in-between. Maybe there's a long distance. Then set up two wifi routers to bridge that gap. If it's a long distance it can be blocked by people walking across it (because that's what people meat does: It blocks microwave frequencies) then just put your antennae higher.
Done, much more robust performance than a bunch a devices operating randomly.