I was searching for this issue online and got to this page. Yes. I am also facing battery issues after switching to Kogan. I am on the iOS 18 version and living in Christchurch City. We do have enough coverage so I don’t think the low network coverage is causing the problem. Just waiting for the latest iOS version to release so that I can test whether the iOS software is making the problem. Other networks are ripping off so not planning to move from Kogan to any other network.