PX4-Autopilot: Memory and mavlink problems pixhawk v2

I noticed that my pixhawk v2 was having some problems, so I hooked up the console in telem 4/5.

What I see at random are different problems:

• Memory problems: this warning comes out “WARNING WARNING WARNING! Revision A has a silicon errata: This device can only utilize a maximum of 1MB flash safely! https://docs.px4.io/en/flight_controller/silicon_errata.html” but I havn’t found any way to fix it. And it’s not only a warning because later this happens:

“nsh: mount: mount failed: Out of memory nsh: mkfatfs: mkfatfs failed: Out of memory”

• Mavlink problems: I have a custom “extras” script to launch mavlink instances. In particular the script is the following:

mavlink stop-all
#ESP
#mavlink start -r 20000 -b 921600 -d /dev/ttyS0
#USB
mavlink start -d /dev/ttyACM0 -b 1000000 -m custom
mavlink stream -d /dev/ttyACM0 -s HEARTBEAT -r 2
mavlink stream -d /dev/ttyACM0 -s ATTITUDE_QUATERNION -r 50
mavlink stream -d /dev/ttyACM0 -s ATTITUDE -r 10
mavlink stream -d /dev/ttyACM0 -s HIGHRES_IMU -r 50
mavlink stream -d /dev/ttyACM0 -s GPS_RAW_INT -r 5
mavlink stream -d /dev/ttyACM0 -s GLOBAL_POSITION_INT -r 50

what happens sometimes at random is this error: "INFO [mavlink] all instances stopped INFO [mavlink] mode: Custom, data rate: 50000 B/s on /dev/ttyACM0 @ 1000000B ERROR [mavlink] could not open /dev/ttyACM0 WARN [mavlink] mavlink for device /dev/ttyACM0 is not running WARN [mavlink] mavlink for device /dev/ttyACM0 is not running WARN [mavlink] mavlink for device /dev/ttyACM0 is not running WARN [mavlink] mavlink for device /dev/ttyACM0 is not running WARN [mavlink] mavlink for device /dev/ttyACM0 is not running WARN [mavlink] mavlink for device /dev/ttyACM0 is not running "

I really don’t know where to start fixing it. Can it be all related to memory issues? Why isn’t it able to open /dev/ttyACM0 sometimes?

PS: I tried to update the bootloader with https://docs.px4.io/v1.9.0/en/advanced_config/parameter_reference.html#SYS_BL_UPDATE without any success.