Having major DB crashing issue after updating to 5.6.3

Hi, my site has been having its error logs "death spiral" causing my site to crash, and now after over a week we have finally realized that free Metabox plugin was updated just previous to our issue beginning (not AIO). I'm not sure which version we had prior, but it wasn't too outdated (maybe a month at most). While investigating what part of the plugin was updated during which version, I've gone to https://metabox.io/changelog/ and can't find that info for last few versions (it ends at 5.6.0 I think. Hopefully you can update this page so my dev can help investigate? And also, most importantly, can you please help by taking a look at this snippet of error code that I'm figuring relates back to the MB plugin update 5.6.3, and I'm now beginning to suspect is related to MB Relationships, which we have only recently begun to use (though we previously had no db issues whatsoever). Here's a sample error:

[18-Apr-2022 05:51:09 UTC] WordPress database error Disk full (/tmp/#sql_19d3_0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") for query SELECT t.*, tt.*, tr.object_id FROM wp_qp_terms AS t INNER JOIN wp_qp_term_taxonomy AS tt ON t.term_id = tt.term_id INNER JOIN wp_qp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('activity-type', 'distance', 'activity-location', 'find-type', 'business-listing', 'age', 'misc-category'[18-Apr-2022 13:09:08 UTC] PHP Warning: mysqli_real_connect(): (HY000/2002): Connection refused in /var/web/staging/public_html/wp-includes/wp-db.php on line 1753

and here is more extensive error log than above: https://pastebin.com/bXAkmEjD

Much thanks,
Sam