Hello, I am getting the same "RX Disabled" error as described abive and my GPS has a lot of trouble finding a fix when the error appears. My solders look fine and I suspect it may be something to do with the software. I tried the "/usr/bin/stty -F /dev/serial0 -echo" command but my read back was:
bash: /usr/bin/stty: No such file or directory
Are there any other solutions to this?