Hi everyone, Im a sad owner of the Teclast X80 PRO, The system gets unstable when using a ADATA MicroSD XC 64GB in windows, For testing purposes I copy a FULL HD video of two hours and playing it on both systems Windows and Android, In Android video finish succesfully but in windows only plays two minutes, after the SD controller disconnect and I need to remove and re insert… The problem dissapears with Class 10 SDHC card 16GB Im really tired of searching information about that… I want to know if at this time there is a solution for this issue, if not Ill send back the tablet and claim for a refund, I bought it through MercadoLibre and I can present a reclamation….