There is the possibility of auto update is unstable, since not so long ago it was added, or be a resource "Premium" with the need for release (which I find unlikely), however, I will give you instructions for manual update.
I’m sorry I’m not exactly what you’re looking for, but it will break the branch until you facilitate/correct this error.
1. Download the Chat version.
2. Log in the administrative panel, go to Settings > Flap System **>* click on the second option, Update information.
Note that on the screen that displayed, it shows the current and the latest version; on the right side, some fields were in red, this means that there are missing features, which are in the latest version. Click on Update database.
After that you will receive the following message in green color:
Your database does not require any update
This means that all updates concerning the DB were applied.
Note: Users with Operators account will need to use the option 'Clear cache' to avoid conflicts. The link Clear Cache can be seen in the system configuration page.
3. Logout.
Using the new version you downloaded, replace the following folders:
doc, ezcomponents, lib, modules, pos, Translations and design.
4. Go on Settings and open the file Settings.ini.php, change to false
the following functions:
'templatecache' => false,
'templatecompile' => false,
'modulecompile' => false,
5. Save, and do the login, go to settings and click on clear cache.
Now go back in the file Settings.ini.php and enable the cache:
'templatecache' => true,
'templatecompile' => true,
'modulecompile' => true,
This should help you for now, I feel the tutorial a little long, I really hope to have helped you, at least until this instability is resolved.