500 and 503 errors everywhere

Hello, for more than a week I have not stopped receiving errors of the type:

Error 503 Backend fetch failed
Backend fetch failed
Guru Meditation:
XID: 53083475
Varnish cache server

The error occurs randomly, there are days that are more and days that are less, and it occurs when accessing a module, or the list of products or in my store on the main page, or in the cart, etc, etc, etc.
It all started when you activated the varnish cache in my prestashop and it seems that it occurs more and more frequently and is becoming very stressful. Stephan says that these errors come from here: /home/mcgranad/public_html/classes/controller/Controller.php on line 134
But I do not know more, I have tried to restore the files but it does not work

I need help fast please!! 🙁

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Quote

Answered: 06/09/2016 6:16 pm

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