file_put_contents Cache Error

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EDIT:
I deleted my cache file again, and cleared cache, this seemed to work today, so no errors anymore.


Running Concrete5-8.4.4, my server did a backup and I ran out of space (Not sure if that is relevant, but putting it in case somehow it is) I deleted the backups and regained my server space, and now I get the attached error.

If I // these 2 lines, it works, but I assume this slows my site.
//        $storeString = $this->getEncoder()->serialize($this->makeKeyString($key), $data, $expiration);
//        $result = file_put_contents($path, $storeString, LOCK_EX);


I decided to upgrade to 8.4.5, didn't fix anything.

mdius