Entry process failures on simple wordpress websites

Website URL

www.archeryclub.co.uk

Error Message

I’m locked out of this site because of entry process failures. Is this a design flaw in the service?

On 9th I had a massive spike of entry process failures causing the site to lock out. There was a traffic and CPU spike on 7th/8th but nothing on the 9th.

Other Information

This is a very very basic wordpress site (it really couldn’t get much simpler) with very few plugins, so how can I diagnose what could possibly be causing these issues?

I had a similar issue with another, incredibly simple site, the day before. Sudden huge entry process failure spike out of nowhere which killed the site for a day.

Anyone know how to diagnose such issues on a bog standard wordpress install? Is there something happening in standard installs that infinityfree just doesn’t like?