Weak Zwave signal Even with multiple range extenders

Hey Folks, one of my contact sensors randomly reports a weak signal to my base station almost everyday. What I find strange is that this sensor has a range extender approx 4 feet away in direct sight. How can the signal be weak? About 25 feet away is another range extender again in direct sight and then another 10 feet is the Base station. Whats really frustarting is that in the ring app you have no idea what device is connected to a range extender or which is connected to the base station nor can you force a device to choose the extender rather than base. On top of all this there is no info in the app regarding zwave signal strenght values in db. How anyone can set these devices up optimaly without this info is baffling to me. If anyone can offer any advice or tips, it would be greatly appreciated. Thank you