Control and indicators not responding when using DMA FIFO in FPGA

Hello all!

I have a problem regarding front panel (i.e., controls and indicators) when using DMA FIFO in FPGA. I wrote a simple program for data acquisition of a DC/DC converter (for which I need sample times in microsecond domain, i.e., time period is set to be 10 us), but when using DMA FIFO my controls in front panel (for input current reference, switch and loop control) are not responding (I even tried with smaller FPGA period - 1000 us). When I disable data acquisition part (marked with red rectangle), control on front panel is working just fine. Any suggestions?

Marko.