You are amazing, thank you so much! It all worked apart from the last one, which said it needs an output file specified so added -o after a quick search. I really appreciate the quick response to, I got in very quickly but only just managed to respond here.
Yeah it sounds like Androids aggressive battery helper is causing this.
Is there any benefit to browsing private mode? Its only stopping history on your phone and not websites, so you can just set normal mode to not save history, cookies etc. Private mode is designed to be temporary in stopping your phone recording history and one button to close them all, so its not surprising that it doesn’t save tabs, in fact its a feature