Quadcopter showing problems while powering with battery

I’m working on a jetson nano based Quadcopter using pixracer pro, but the problem I’m facing is when I power up the drone using 6s battery the quad sometimes is unable to power the rfd900 and sometimes the gps start working abnormally. I have tried providing separate power to rfd but still problem not going off. Also the log files are coming empty without any data.
Blheli 4in1 esc
Here 2 gps
emax rs2205 2300kv motors
6s 1300mah lipo battery
Rfd 900
power module v6.0
polulu 5v step down buck converter for jetson
frskyxsr receiver

Please let me know what I can do…

Try:
BRD_BOOT_DELAY,3000
which should let things stabilise before the flight controller finishes booting and starts interrogating devices.
Also there is this parameter, but it’s usually not needed:
TELEM_DELAY,2 (2 seconds)

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