I hadn't been using TagTime for a while, but I recently re-started on my new phone (a Samsung Galaxy S7 running Android 8.0.0). Unfortunately, half the time I am not notified of pings and they get recorded as OFF. It's kind of useless because I have to go back through the list and try to remember/estimate what I was doing at the time, but that mostly defeats the purpose. So far I have not noticed any patterns as to when I do or don't get notified about pings, it seems relatively random.