If it’s working, then you won’t need new batteries – it’ll tell you if low battery power is the issue. You should only have 1 hub for 14 timers. You can have something like 32 timers per hub. If you can load the timer in the app, then there doesn’t seem to be a networking issue. Even if there is a networking issue, the pre-set timer and settings is store in the individual devices, not the app. So you can have the faucet disconnect from the network, and it will still keep on going as per the last schedule sent to the device (someone please feel free to correct me if I’m wrong).
Which firmware are all your devices on? Which models are they?