Hi, the loss counter indicates that the data was lost in USB layer, perhaps due to CPU load, the usb processing thread did not collect it fast enough, and the hardware had to drop some packets.
Maybe increasing the USB data transfer batch size could help, like it did here: LimeMini Maximum stable USB3 Rate? - #13 by oe1rsa
For gnuradio plugin you can modify it here: LimeSuiteNG/plugins/gr-limesuiteng/lib/sdrdevice_block_base.cc at a580f9cbc7bec9478ac08d93513690714a1753dd · myriadrf/LimeSuiteNG · GitHub