Thanks for adding another bit of information. I assume you haven't recently powered down, or otherwise have diminished your SP? I know that I haven't, nor have I been posting rampantly lately. I have actually been posting a bit less, as works takes more of my time.
So, an interesting event, affecting at least 4 accounts today, that I am aware of, with no known cause.
RE: "Bandwidth limit exceeded. Please wait to transact or power up".