Hi Miguel,
Thanks for reaching out to us with this issue here on our support forum.
I would like to point out that this normally happens when you have either:
- Too many plugins installed
- Your server is not ready for the plugins you installed
So you can raise the amount of memory you server can you by following this guide, but it that doesn’t help you will need to contact you hosting company.
If that doesn’t help you will need to deactivate the plugin that is causing this issue, or the combination of plugins.
My Best Regards,