You are not alone, pre-1.7 worked flawlessly. Let me guess if you open the app you are then detected properly, this will last for a few days.
I have been in contact with support for weeks and they have told me the problem was fixed in 1.7.2. 1.7.2 did help a little but it’s still not like it was before. 1.7.3 was released yesterday which now has the option to be able to send your mobile presence logs to support. This proves they know there is a problem and can hopefully use this data to form a fix. For me, presence detection is the heart of my setup and it is very frustrating when it fails. I have been contacting them every time it fails and while they have been very nice in their responses, I am not convinced they fully know what the issue is yet.
PLEASE if you have issues, contact them! Don’t just say “well someone else already contacted them”. We need this fixed and need everyone having the problem to tell them so they can work it out.
I’m convinced that the app gets “stuck” and no longer reports your location, opening the app clears it right up. This works fine for a few days then gets “stuck” again requiring you to open the app again. This was never needed on the previous releases.
One of the main fixes I have been told is to logout and log back in especially when you update. My daughters phone has been the most problematic I think because she does not open the app very often. My wife has not updated since 1.6.8 and hers works every time.
Some people have asked them to re-release a pre-1.7 version as a second app just so people can get their systems back up and running, I don’t think this will happen. I happen to have a copy of the 1.6.8 release that I have went back to a few weeks ago and everything works fine but now I am using the latest on the hope I can help troubleshoot and get it working again. My patience are running thin though and may wind up just reverting.