Danalock V3 Z-Wave dropping connection

Hi Guys, i am after some advice...

I have had a danalock v3 z-wave device on my system for around 4 years now with no problems, its always been incredibly stable and reliable. Until now. Just lately it keeps dropping its connection to my system within a day or so. Nothing else has changed on the z-wave network and its about a metre from the hub. I just cant work it out and its driving me mad.

Ive got a second unit that i have tried and that one connects but when the signal is sent to unlock or lock the device, it just flashes red or green (depending whether its a lock or unlock command) but doesnt actually carry out the action

Anyone got any ideas whats going on here?

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