Iphone 5 texting issue, messages disappear after I hit send?

All of a sudden when I send a text on my iphone 5, it disappears right after I send them. The person is still receiving them however, but it is frustrating that they are disappearing.

Anyone know how to fix this?!

Thanks!

Added (1). Also forgot to mention that my lock button doesn't work so it is hard for me to reboot it.

Here's A Simple Fix That Might Work For You:

Try Holding Down The Home And Power Button At The Same Time Until The Phone Fully Boots Up (Past The Apple Logo)

After, Close The Messages App In Your Multitasking Menu -
Turn Airplane Mode For 5 Mins And Then Switch It Off

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