Bluetooth not working in low temps

We have been having issues with Bluetooth not functioning, until you pull the batteries, then will work again for some time. Z-Wave has been working 100% all along.
I have a hunch this has been since the ambient temps have dropped. Hasn’t been above freezing here for about 5 days and thats about when it stopped working. Cant be totally positive.
This is on multiple iphones on both the older (1.12.4) and newer version (2.0.6) of the app.
Anyone else?

@Weingart please feel a chance to check the ticket 121393 out.

Replaced batteries, so far ok. But at same time ambient temps have been increasing.
Note: With old batteries, which were factory batteries only in use about 2 weeks, displayed 100% in app.