The problem your having sounds like the sd card is not making contact with the sprung pins, take out the card and make sure the little plate it is slotted into has a dent facing towards the card so that it pushes as much as possible making a tight fit when you push the 2 lips under the retainers either side. More often than not problems happen because the sd card is not making proper contact on the sprung loaded tiny contacts it sits on top of. This is in my opinion another hardware design fault as it keeps coming up on this forum in many weird forms of problems. I have used both 16 and 32gb versions with no problems whatsoever but i have made sure the sd card is pushed as hard as possible against the contacts. Problems related are as follows, Device not seeing the sd card, See's the sd card now and then, Only part of the sd card is recognised, Gives weird messages like sd card not formatted or data is corrupted.