tx without reffill the buffer

I want to transmit and receive with pluto at high sample rates and because my signal is periodically I just need to fill with samples the buffer once and avoiding to redoing the buffer write process maybe can save time to speed up the sample rate.

I tried to call the push function in tx buffer several times after fill the buffer with samples but for some reason I see lost samples and don't know if this behavior is expected or I'm doing something wrong or missing something because still I'm not clear with the iio driver behavior.

Thanks,

regards.