I think this may happen due to a race condition where Patch Level 1 is successfully uploaded/activated during a sub-request rather than a main request (such as css.php or deferred.php, rather than on the containing page). In such a case, the patch will complete but will not be marked as complete. The patch will retry approximately every 5 minutes indefinitely, but every retry will fail with an error "Please enter a valid value for this option". If this occurs during a phrase rebuild, the error message would interrupt the rebuild. I messaged you instructions to correct the looping patch. Please try the instructions and let me know if it helps with the phrase issue. If it works, I will update the download area with similar changes.