Unhappy [Q] Yusun W808 incoming call reboot problem

Hello!

I have problem with my Yusun W808 bought on PandaWill. When I reveive call from someone and slide to answer the phone make reboot...
I try to resolve problem with reset to factory settings, but this is not working.

Video from someone:
YOUTUBE/watch?v=0lZHMmDiUYc&hd=1

My video, look at the problem:
YOUTUBE/watch?v=ca-lm1QJ9BU&hd=1

Can anyone help me?