Thanks for reply.
No, it's dont have external power supply. I asume box require max 1A and for USB 2.0 / 3.0 max is 0.5A / 0.9A. It shouldn't by trobule speical he came with 2A power supply. I assume frequently work on maximum power caused some damage.
I decided test other power supply, beacuse it's was works fine on begining. So I bought some AC adapter V5 4A. I aware of power reserves, it was intencional in the hope that it will withstand 2A without any problems for long time.
Now I doing stress test and after ~200gb read it's look to be fine now.
Btw. I not expecting much from this cheap tv box. It was missed purchase as TV Box, unused, so I thought I make linux server form him for media. If it turns out after some time that the problem still occurs, I will simply throw it away and I will go in some other solution.