Users in Apple’s forum reported some common problems that are listed below...

• Battery health drops after upgrading to the latest iOS.
• App store crashes after upgrading.
• iPhone freezes and doesn’t turn on.
• Stuck on Activation screen/ stuck on loading or apple logo.
• iPhone stuck on “Hello” screen
• iPhone 6 frequently restarts
• Error 69 on iPhone update.
• Stuck on Boot/ Boot-loop issues on iPhone 6

Some users have reported other problems with similar symptoms on their phones which loosely qualify under the iPhone 6’s software issues. Some user thinks that the no signal/ no Wi-Fi problem falls under the “software issues” category, but it is a separate issue which requires a separate mode of service.