As I suspected last night - dead battery - charged now and running for ten more minutes and we'll hope for the best from there. It's worked properly for five days and I drove a LOT yesterday and it locked perfectly each time. Until I got home last night, then it didn't. I got it to beep but that doesn't work after it hasn't done it properly. Very irritating. Send vibes and xylophones that there are no more issues this week - but this is why I didn't really want to do any long drives like the one I'm about to do.