Clicks and Pops Using ESI Maya 44XTe PCIe

Hi at all,
i’m working with Cubase Elements and ESI Maya 44XTe PCIe audiocard that runs under Win7 X64 on one of the latest Intel i5 and 8Gb of DDR4.
When i started i choose 128 like a buffer, but with only 1 midi track i heard clips & pops. I moved to 256 (5msec In, 5msec out). But the result is absolutelu the same!
Not possible such a thing in that system!
In your opinion, am i try with oldest ESI drivers?
I say thank you at all in anticipation.

No hints?