Do you have viber installed? If yes, try uninstalling it.
If that doesn't help, make a backup and then increase your system partition by about 15mb and restore the backup.
If the above doesn't work, I don't know what else could... If I were you, I'd just backup apps and make a fresh install. (Usually I don't face problems like this)
Do you have a question about the HD2 ? Ask it here for an instant response.
nexus⁴: Stock 4.4 rooted & xposed.