I'm chasing something like this right now that started very recently. We have a handful of telematic devices out in the field that will just randomly stop send

I'm chasing something like this right now that started very recently. We have a handful of telematic devices out in the field that will just randomly stop sending information; no power disconnect events, no losing network connectivity events, nothing to indicate there are any issues. One day a device is fine, then the next it isn't. What makes it even more aggravating is that some of them randomly come back online and shoot over all of the missing date from when they went dark, but apparently still functioned as intended during the interim. At the moment I have no idea how to reproduce the issue but I have a few theories as to why it might happen: lithium ion backup batteries finally going bad, cold weather affecting the batteries, or an incompatibility with the device configuration code and its current firmware revision.