This is now happening to me as well after updating to firmware 1.8 and using configuration app version 1.7 on windows 10. I am able to set the time. The LED on the device remains a constant green and does not flicker with the app flicker. I downloaded the old version of the app as you suggested, Alex, and it also exhibits the issue, though the flicker is less frequent than it is with the new app. I have energizer lithium AA's in the audiomoths for what it's worth.