The device becomes unresponsive for a short period after sending a reply to an email in the Mail app

Category: 

Mail

Severity: 

Moderate

Description: 

When sending an email in the Mail app, the device becomes unresponsive for up to 30 seconds--with the amount of delay appearing to be proportional to the age of the device. This appears to only happen when you send after replying to an email, not when sending after composing a new message.

Bug First Encountered: 

iOS 9.0

How often the bug occurs: 

Sometimes

Device(s) bug has been encountered on: 

iPhone

Status: 

Active