Too litte too late. I have a mint 343 with the lockup issue. I can't risk loosing my data in the upgrade. Buying a readynas today.
I think that it is a core hardware design problem intrinsic in the 343 and not solvable by a firmware upgrade, hence the lack of response regarding firmware. I think that the moderator can't find a solution, and we are all buggered
Mine worked flawlessly for about a year, now i reboot it daily daily. It has been completely protected with top of the line power protection etc..
You can have mine for $250. I am in Toronto Canada and will sell locally. I wil also bet that same amount you won't see a firmware that fixes this problem in the next 6 months, if ever.
If you sell reliability you need to have it. Nobody can wait a year to get their nas fixed. The need it the same week.