Summary bot traffic spiked from the typical 4 x traffic to 9 x traffic causing the website to use too many resources and making hosting.com suspend the site to protect the other website who share this VPS server!
Big thanks to hosting.com for resolving this quickly.
FYI At the same time Cloudflare and an unnamed hosting company was dealing with
Follow on from [Resolved] Is MantisBT and the wiki being inaccessible for everyone? - #30 by gramps-project