Dan -
My suggestion to go back to 3.228 was only a joke.
However, the lamp coming on by itself should be looked into.
You said the Activity Monitor recorded it.
Did it show it as a "receive" command or a "Macro" command?
"Macro" would indicate it was turned on by either a Macro or a Timer (AHP doesn't differentiate in the logs between the two), and a "receive" would indicate it came from somewhere else.
If you see a "receive RF," then it is a remote somewhere that probably did it (or a motion sensor, perhaps? - I don't know what components you have in your system, or what codes they are set to).
Was there anything else going on in the house at 4:44 PM that could have maybe caused a button to get pushed on a remote or something (like a remote falling off a shelf or something landing on it, or something)?
It might be a flaky and/or stuck contact on a stick-a-switch, too.