It could be that your DB is corrupted and you need to Repair it using your Cpanel. The other thing to check is that the '/ramdisk/mysql/tmp/' folder has enough space - it could be that a recently installed plugin or extension is filling up your tmp folder with data that overruns the size of that folder.
Try uninstalling Gantry 5 and download a FRESH copy then install a using Joomla 3's Upload Package File dialogue.
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