I have the same issue with my Galaxy Note 2. Sent it to local distributor service center in Turkey. They sent it back to me immadiately labeling it “No errors found”.
But we all know that this is a Sandisk 32 gb Class 10 Card issue. I have previously written to Sandisk support, before sending to local distributor. They told me I could send it to their base in Czech Rep. if my local seller does not replace it. BUT ı have to pay for the sending cost. Postal would cost as much as buying a new card I assume 
