These issues however can be resolved if it is just a bug or a glitch in the iOS software. You may try these following steps and see if it works for you

• Force Restart your iPhone 6
• Update your iOS Software

(If, while in the progress of updating your software, the progress bar under the Apple logo has not moved for an hour, You may connect your iPhone to a PC and select “Update” when prompted)

• Remove all third-party apps from your phone. Install Apps only from iStore.
• Turn off the auto-update of your iOS apps to prevent further interruptions. BUT BE SURE TO UPDATE THEM ON A REGULAR BASIS MANUALLY.

If none of the fixes above work, for you. You might have an issue that needs the touch of a professional iPhone technician. Here at ifixit bd, we have dedicated and experienced technicians who specialize in fixing iPhones. ifixit bd is a prominent iPhone servicing center that is located in 4 locations around Dhaka, Bangladesh.