Pixhawk and mavproxy

hi guys

i use Rasp 3 A+
fixhawk 3 pro
mavproxy or mavlink-router

so i have some problems

first, mavproxy outputting random string

second, repeat dead, reopend

now makeshift
on linux service
Restart=Always option

mavlink-router and mavproxy have same problem so , i think FC is something strange

sry my bad English pls help