Perhaps someone can name a specific router (Brand name and model number) that we can order and try? We have test OS 3 units connected to Netgear and Asus routers and have not have any disconnection issues, so it would be difficult to debug without having a router that it actually has issues with.
Something else that’s worth trying is to see if settings a static IP on OpenSprinkler would help. I suspect not, since I assume the issue is in establishing WiFi connection and not in DHCP. But nonetheless it’s worth a try.