Most likely iOS's shitty power saving. There is a method that claims to disable it. But it could be outdated, and not work anymore.
Went to bed early, and my phone got connecting alerts. So it was disconnecting again. Could be the third party four port charger. But it's probably the latest iOS version. The version before that might of been fine.
Didn't fall a sleep. So drank some more Gatorade.