We’ve acquired a few of these units to trial them and essentially they work well. We are supply a 5V DC supply and read the output as a 0.2-4V voltage output. As far as we can tell, it works fine. Except that after about 8 or so hours, the 4 little orange lights begin a slow flash. We are confused by this because the Blogs we’ve found discussing this suggest the device is in trouble from a low supply voltage. Does anyone have advice on what we are seeing here and why?