iMessage - gray bar covering text entry field
I upgraded to iOS 9 on my iPhone 5s, and later that day a gray bar with "0:00" appeared over the text field of the iMessage app so that I can no longer see what I'm typing.
I restarted but that didn't fix it. Then, for no apparent reason, the gray bar disappeared for a few days. But now it's back. Restarting has fixed it this time (so far), but I'm worried this will keep happening, and that restarting won't always fix it.
Any idea what's causing it?
Thanks
iPhone 5s, iOS 8.4, null