CPU user usage matches resource limit every day around the same time

As of past few weeks, I'm getting e-mails like these every single day around the same time (8h20min):

Zitat

Resource limit matched Service localhost

Date: Tue, 03 Nov 2015 08:17:59
Action: alert
Host: ATLASBOX.AMARAL
Description: cpu user usage of 95.2% matches resource limit [cpu user usage>95.0%]

Your faithful employee,
Monit

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Here's a few graphs:

What can I do or how can I tweak monit to give me all the information I need to understand what's going on?

My NAS runs 24/7, there are no sleep/shutdowns at that time of the day. I don't want to uncheck that option because that's how I found out of this problem and it might be something I need to resolve and not let it go.

I'll take a look at all the cron jobs on my system. In the OMV admin panel, only 2 are visible and are 2 custom ones. They both run more than 1 time a day so if it were one of those, I'd have multiple spikes through the day and not just one in the morning.

Can't seem to find the root cause. Requesting further help please...

Ah, good point...
Cause I need to sleep?

I'll see if I can do that tomorrow...

Used top in batch mode and found out the culprit was Plex doing stuff in the background.

Thanks.