I've seem some posts on battery drain. One suggestion. GOS FAQs recommends "LTE Only" to reduce attack surface. If you have fast battery drain and are not concerned about a Stingray downgrade attack (new models get LTE anyway), try just "LTE" as preferred. That way you will also connect with 3G and 5G. Depending on your carrier/coverage/where you live, your phone may be draining battery switching cell towers all the time on "LTE Only". Worth a shot. No guarantee.