No issues so far on the latest firmware / player version combo
Lol, I always let this thread lapse in my reading until there's a new firmware rev, where I resume reading here to make sure it's working for other people.
Overall my M11 is doing fine after a year, except for the horribly slow card processing when I have to do a rescan or use the FiiO player which is so slow to navigate the card directories. Here's hoping the stuff that works keeps working, I've given up hope on the slow card access after giving FiiO the data they requested _long_ ago.