Here's a thread which discusses the same issue: Text Message box issue : record with time showing | Apple iPhone Forum
Go to Settings>Messages>Show Subject Field and turn the switch on and off. This has worked for others with the same problem.
No need to reboot. Simply closing down messages and restarting is enough. It appears that it's either a bug, or an inadvertent press of the microphone key, which leaves the Messages app waiting for a voice message.
Split screen? What is that? I'm running IOS 10.1. Also, Does IOS 9.5 have the KEYCHAIN feature? Thanks
Split screen is a feature available to the iPad Air 2 and newer with the introduction of iOS 9. The iPhone can't use split screen. Keychain will work with iOS 9 on all iOS devices.