Z wave extender or Base issue

1 of 2 motion 2nd gen sensors and 2nd gen keypad intermittently fail. Both were replaced. The motion sensor triggers a false alarm in away mode. The keypad won’t work touching the extender, only when within 8 feet of base. If extender battery is removed&unplugged it still shows online. Also Removed failed device and added back. Same status and unresponsiveness. 3 false alarms 5 calls to Ring 8+ hours spent on this Ring support says I need an additional extender. I say it’s either a bad extender or something in the base like a software upgrade that changed.