For the past two days, all three Nest locks in my house have suddenly started going offline, then online, then offline, then back online every day at 0800 and 1800. After they come back online they no longer auto lock nor log any unlocks or locks until the batteries are removed and replaced. The locks have been installed for several years and not had this problem before. Batteries have been replaced in all the locks, but I wouldn't expect it to be a battery problem since it's happening to all the locks at the same time.
I can see how this could be frustrating to experience, and I would love to look into this further for you. If you haven't already, you can learn here how to factory reset your Yale lock, which may help to reset issues it may be having. Please let me know if you need further assistance.
I'm not in the country where my residence is, and I won't be for a few months, so I won't be able to do any definitive testing until I return. The locks appear to be working close to normal again, but occasionally the Connect will report that it is using battery power even though it's connected into the wall socket, and some of the locks are still randomly going offline and coming back online after a few minutes, at random intervals. Sometimes it's 10 hours, sometimes it's 12 hours, sometimes it's 9 hours.
Just an example:
Back Door and Front door:
Offline at 0634, online at 0636.
Back Door only:
Offline at 1540, online at 1545.
Garage Door only:
Offline at 1804, online at 1806.
Back Door, Front Door:
Offline at 0633, online at 0636.
Offline at 0617, online at 0626.
Offline at 1013, online at 1023.
You'll need to wait until you're at the device then to troubleshoot further. There is little to no support you can provide from afar. Please let us know when you'll be back to the device. We'll leave this thread open for a few more days.
If that's the case, we'll close this thread and when you're ready, you can create a new thread and we can go from there. We'll close this thread down in 24 hours, but it will remain open until then.