"iPhone XR Slow and Bluetooth Issues After iOS 18 Upgrade Prompt

Ever since the release of the iPhone 16, my iPhone XR has been running noticeably slower. I'm currently on iOS 17.7, and I’ve received a prompt to upgrade to iOS 18. However, I've been experiencing some strange issues, like my Bluetooth randomly connecting and disconnecting, and overall, the phone has become extremely sluggish. I'm curious if anyone else is facing similar problems, especially after upgrading to iOS 18.