Troubleshooting I originally thought it was a issue with my iPhone and I troubleshooted as such. While I am a IT Admin I am no Apple Genius and am new to the Ecosystem after having avoided it my whole life until this year. Now I am in deep. I do, however, have good troubleshooting and googling/forum searching skills. I did the following to troubleshoot what I believed at the time was an iPhone issue; Power on and Off Multiple times throughout all other Troubleshooting Steps. Delete and reinstall the apps (Even though it was all 3rd Party Apps) This didnâ t work either. The App deleted fine but when I tried to reinstall It would download ¾â s of the way and then go right back to as if I never clicked download. Reset All Settings. Restored from an iCloud Backup by Resetting Phone Completely and used my Backup to Setup Phone. Issues Continue Phone worked All Day until I got home and again synchronized with my MacBook. Same issue. Same results. I still didnâ t suspect the MacBook because of the time between Sync and finding the issues occurring due to me only having used Podcast app during work. Issue Worsens, Boot Loop After that time, I Restored from Backup I had just made on MacBook and during the Process where the iPhone goes to Reboot with Apple Logo and Progress Bar it got ¾â s of the way through and stopped and rebooted and then rebooted over and over From Black Screen to Apple Logo back to Black Screen and repeated for a long time. I wasnâ t sure if I should stop it by unplugging it but that seemed like a worse option and just in case it was working or going to work. I looked for help online and got on Apple Support Chat and they said to unplug, power off by quickly pressing Volume Up then Volume Down then holding in the Side button until Apple Logo Appeared. Once on restore screen I plugged it into my Windows 10 Laptop running Windows 10 Version 1909 on a HP EliteBook 745 G6 since I had suspicions of the MacBook. This laptop has the most recent version of iTunes installed (I think 12.0.11?). This was my daily driver laptop and what I synchronized my iPhone with prior to getting my first MacBook recently and I still used it for my Job. When I plugged it into the PC iTunes immediately recognized it was in restore mode and asked if I wanted to Restore or Restore from Backup. I chose to just reset it and start from nothing as I didnâ t trust my backups due to corruption. It failed and asked to try again and after rebooting the PC and the Phone I tried again to no avail. It was still stuck in a boot loop. Best Buy Geek Squad Appointment I made an appointment at nearest iPhone Repair shop listen on Apples Support Site after creating a case and it was a best buy 45 minutes away (Rural Midwest). Getting there they got my iPhone reset in a jiffy and were extremely nice and helpful. I told them what had been going on and the tech thought it was iPhone but had never heard of the problem. I told him I thought it might have something to do with MacBook but couldn't confirm. He didn't think so since it was new and said it could be my iCloud account. He offered to try and get my Phone replaced as it was still under warranty. I declined as I wanted to ensure it was my Phone before going through the hassle. Focusing on MacBook and Verifying Source of Issue Returning home, I decided to dig deeper and try some things out. Synced my wife's iPhone 11 and BOOM, same issue. We restored from Backup form iCloud made moments before the syncing. Did it with my new iPad Pro 12.9 2020 and BOOM same thing. Restored all the same and then tried it on backup iPhone 6 S and BOOM Nothing happened. It was fine. No issues. It has all the same apps and content as my other iPhone and iPad and nothing bad has happened to it yet. I am positive it's the MacBook. During all this it has caused havoc with setting up Apple Watch 5 44mm over and over and my Air Pod Pros and Apple TV 4k are the only things not giving me problems at this point. What I am doing now I am currently in process of resetting MacBook Air by Erasing Disk in Disk Utility after booting into "Restore Mode" or whatever Apple calls it and reinstalling BigSur. I will see how it see if I can Sync after this is done.