SSL test flapping after latest snapshot

I upgraded a rather old hobbit install that I have (I don't remember what version, it was an early beta), and afterwards an HTTPS test I had against a host started flapping (see attached screenshot).  Is there a recommended way for me to diagnose this problem?  Otherwise my next plan is to completely wipe the old install except for the RRD files, then build and install the latest snapshot again.

-Charles