Hi Chris,
A couple of things- the first is that as Survey123 uses location services more frequently than normal apps, we do expect the battery to drain faster than normal usage of the phone. Additionally, you may have heard about some stories with regards to older phones - as a phone ages and the battery gets to the end of it's lifecycle (in normal use, around 3 years), the battery life will shorten significantly.
As for the Collaborate page, the link provided is not a form setting - it's just a helpful way to select how you want to share the form. It reseting to the first option on load is normal- it has no effect on the form or previous copies of the link you made. That being said, someone should only need to use that link once- after that, the form is downloaded and accessible simply by opening the app.