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2 minutes before each hour, my site is unavailable. This happens hourly.
I think it may be a function that sends thousands of unnecessary queries to the database and overloads the server.

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There is nothing in Q2A that does what you describe.

It could be the result of a plugin. I believe there was a cronjob plugin for Q2A, are you using that?

Do you have any real cronjob a set up on your server?

What about access logs? If you look through them for the times you have problems, maybe you can see a problem. Could be a spambot or something else misconfigured.
Thanks, Scott.

I thought to update the limits to avoid spam.

On my site, it is very often the users reach the limit of posts or votes per hour.

How do I know if a plugin has used cronjob?
I installed plugin Best user per month in one day, but already uninstalled.

Plugins of my site:
Basic AdSense
Q2A embed
Event Logger
Example page
Facebook Like Box
Faq page
Featured Questions
Mouseover Layer
My followers page
On site notifications
OpenSearch Support
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Widget Anywhere

I did not programmed any cronjob.
But I've had other plugins.