It may be that once were false-positive. But in each notice the downtime by pingdom, the technicians had to do something, restart the server, kill processes, mysql, etc.. The day 12/18/2013 were 3 hours and 29 minutes downtime.
i using pingdom. Statistics show now 6 hours and 14 minutes downtime since 12/12/2013. I have asked for explanations, but do not tell me anything, just that everything works fine or
"There were some processes causing high load on the server. I have killed those processes and the load is normal now."
if it continues you should look at moving host! if its a CPanel host you have, look for someone with CloudLinux which stops other users from being able to take over the load of the server. From experience cloudlinux stops nearly all load issues caused by user's accounts.
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Have you taken a look at your website first? scripts that are resource intensive maybe maxing out. And if your on a shared server, then the Resource limits for your account will be capped - If your scripts Resources are running above your cap, your site is crashing - and if this is the case...
What server are you on and what's monitoring it out of curiosity
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