I have had that the last few days also - but never before and not every time. Not mediated out - it even happens at the start of a Glitch day sometimes. Once it start happening, it keeps happening until I log out. I don't know if it is gone if I log back because I just go away.
Yes, it is a known defect. Yes, refreshing fixes it immediately. I haven't heard of anyone that refreshing didn't fix it (I monitor Live Help whenever I am on).
I just finished Meditation III and I'm disappointed. I hear the waaaank alarm more than I get positive results, even when I drink a bubble tea. I've never been anywhere near max'ing out on daily meditation. I'll try the refresh. Guess I'll send a bug if it doesn't improve.
Happened to me yesterday, not just in my house. After a couple of dozen failures, I did a bug report. When I went to the next zone, I got a message saying "refreshing for bug fix" or some such and it reload and then it worked fine.
glitchlog updates that it was interrupting you whenever you got a local, group or party chat notification :P That was some pretty fragile meditating :)