This first minidump file is referring "RtkHDAud.sys" crashed which is sound chip (or card) related file.

The second minidump file is referring "nv4_disp.dll" crashed which is the NVidia display card file problem.

Try to update the sound chip and display card driver see whether it solve the problem.

OR should you send it back to the vendor who sold you the machine since it still under warranty.