Why does my messenger not work?

Hi,

Don't know why it stopped but you should be able to fix it by doing a hard reset.

Before you perform the following ensure that your battery is fully charged

First backup your apps and data.

Here is a link to show you how.

https://support.t-mobile.com/docs/DOC-57...

Then perform a hard reset.

Here is a link to show you how.

http://www.hard-reset.com/lg-optimus-l9-...

Be aware that when you perform a hard reset the all downloaded apps and user data will be erased and your phone will be restored to factory default settings. That is why it is important to do a backup first

Once phone has rebooted you can restore your backed up data and apps. (See the first link above)