You don't mention what you're running, but based on your previous posts, I will assume 4.5, and not -current.
Since 4.5, there have been mbuf problems resolved, as well as a migration to a newer version of symon (2.79) You can either try -current, or wait two weeks and upgrade to 4.6.
If neither of those options are of interest, take a look through the symon source code, see what data it is collecting, how it collects it, and then collect it yourself and manually review it. You're not going to get problem source identification through looking at a graphical abstraction of unknown data.
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