Page crash problems

Anybody out there now to help please!

I have a problem that keeps recurring on my wordpress website. I have regular page crashes even when I am not working on the website. There are no error logs on my server so I do not know what to do. If I delete the cache on the website it fixes the problem but within a couple of days it happens again without warning.

I have not deleted the cache as of yet, in the hope someone here can take a look at the page. Link

I hope someone out there can help.