I am having the same issue with my V3.
at first, it worked fine and would get a fix in a few minutes but recently i have no connection to the GPS. the IMU is working and sending data but i get no connection or data type recieved from the GPS via the TTL
Any ideas on how to fix this communication issue?
Below is a log of the data that openplotter sees with only the V3 wired up.
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GPGSV,1,1,00*79
$GLGSV,1,1,00*65
$APHDM,25.989,M*0C
$APXDR,A,0.142,D,ROLL*6E
$APXDR,A,0.297,D,PTCH*77
$GNGLL,,,,,,V,N*7A
$APHDM,25.851,M*08
$APXDR,A,0.154,D,ROLL*69
$APXDR,A,0.303,D,PTCH*7B
$GNTXT,01,01,01,More than 100 frame errors, UART RX was disabled*70
$GNRMC,,V,,,,,,,,,,N*4D
$GNVTG,,,,,,,,,N*2E
$GNGGA,,,,,,0,00,99.99,,,,,,*56
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GPGSV,1,1,00*79
$APHDM,25.975,M*0F
$APXDR,A,0.153,D,ROLL*6E
$APXDR,A,0.305,D,PTCH*7D
$GLGSV,1,1,00*65
$GNGLL,,,,,,V,N*7A
$APHDM,25.832,M*0D
$APXDR,A,0.112,D,ROLL*6B
$APXDR,A,0.304,D,PTCH*7C
$GNRMC,,V,,,,,,,,,,N*4D
$GNVTG,,,,,,,,,N*2E
$GNGGA,,,,,,0,00,99.99,,,,,,*56
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*2E
$GPGSV,1,1,00*79
$GLGSV,1,1,00*65
$APHDM,25.694,M*0F