Been having brief but increasing frequent bouts of outages. This is especially annoying because I'm paying for premium hosting for this forum for the specific purpose of ensuring reliable uptime. Oh, the bitter disappointment!
I'll keep limping along and complaining about this to Invision Power Board... for a while. If it keeps up, I'll just give up and revert back to the old forum.
I think it was Sublime Master BrntToast who prophetically cautioned about this move, "If it ain't broke, don't fix it."