hi group, I am working on the GPS data collection, I Need help. If anyone who has been working on the u-blox GNSS Evaluation Kit Time EVK-M8T before and have seen it, please help. I do not know why sudo cat /dev/ttyACM0 only 1 time. I have the U-blox EVK-M8T which can read the NMEA messages through the Ubuntu terminal window. When I have good set up, and type the command `sudo cat /dev/ttyACM0, it show me the NMEA meassages, such as: $GLGSV,3,3,09,87,06,340,*52 $GNGLL,,,,,140236.00,V,N*56 $GNZDA,140236.00,10,03,2017,00,00*7C $GNRMC,140236.85,V,,,,,,,100317,,,N*68 $GNVTG,,,,,,,,,N*2E $GNGGA,140236.85,,,,,0,00,99.99,,,,,,*77 $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E $GPGSV,3,1,12,10,76,330,52,11,03,322,44,12,23,100,47,14,32,270,44*7E $GPGSV,3,2,12,15,10,077,,18,70,123,46,20,02,130,47,21,22,189,47*73 $GPGSV,3,3,12,24,40,050,49,25,16,142,39,31,13,211,48,32,52,288,50*72 $GLGSV,3,1,09,69,26,096,28,70,62,024,37,71,30,315,29,73,37,171,36*6A $GLGSV,3,2,09,79,20,030,,80,64,095,31,85,09,235,27,86,20,287,33*62 $GNGLL,,,,,140236.85,V,N*5B $GNZDA,140236.85,10,03,2017,00,00*71 but suddenly, it stopped running without touching anything, I did not know why, and I tried to run again but it did not run. Until, mechanically unplug USB cable and connect a gain, it worked. it happend again again and again... Does anyone know what is going on? Thank you.