Phone freezes while in mid text--???

Just recently my phone freezes-becomes non responsive- while in mid text and I have to wait a short bit and then it will 'come back to life" it seems to be more prone to happen if I am editing a text and or backspacing--hve no idea why this is suddenly happening but its very annoying not to mention inconvienent.. tried freeing up spance on the phone just in case this was the issue but it still happens.. anybody know if there is a way to resolve or why it is happening