I'm not surprised you had issues with that wifi repeater. The way those kinds work, they just take an existing wifi signal and repeat it back out. This kills 50% of your bandwidth for devices connected to the repeater. A better option is a mesh network system (like anything on this list https://www.wired.com/story/best-mesh-wifi-routers/). These are much smarter and can tolerate things like a node being taken down, so should work better than that repeater.