Problem while working with xSPY

Hi
My english is not so good, but I think that you will understand.
I have problem with xSPY when I want to see voltage signal. I use PMSMFOCSL01 control on XMC1300.
xSPY don't show the whole period so the signal look like that is cut and linearly connected with the beginning of the next period.
I think that problem is with buffer, maybe it is short and then information of variables are cut off. How to change when xSPY refresh buffer?