DLPC910: Rows missing after few hours

Hello,

I'm working with DLPC910 and DLP9000x, I'm driving DLPC with Xilinx FPGA (xcku060).

I'm having problems after few hours of work, it seems that the first rows are blank (or float).

I Verified that I send the right data and not zeros (in my FPGA's OSERDES input) to those rows and the whole flow seems fine.

When I reload the DLPC910 (INIT process starts again) the problem resolved.

Do you know what can cause this issue or did anyone had something similar? 

thanks,

Roy