I think it's clear at this point that Garmin have accepted there are multiple issues with the new update. I'm sending my 955 back (under warranty) for a replacement (I understand it'll still likely happen on a new device).
My issue's were a frozen screen approx 3-4 times a day after receiving notifications and extremely poor battery life, losing over half my charge over the course of a day.
Is anyone aware of a fix coming soon otherwise it's enough for me (and appears some others) to start losing confidence in Garmin and to look elsewhere.