Jetson Nano failed to boot

I put on the sd card, hdmi, ethernet, mouse&keyboard and power with 5V/4A power supply using Jetson Nano EVB.
Sometimes, I found Jetson Nano failed to boot and see the green led is on, monitor, ethernet, mouse&keyboard no action.

I captured the event log as below,

[0000.120] [L4T TegraBoot] (version 00.00.2018.01-l4t-39a9dc3d)

[0000.126] Processing in cold boot mode Bootloader 2

[0000.130] A02 Bootrom Patch rev = 1023

[0000.134] Power-up reason: pmc por

[0000.137] No Battery Present

[0000.140] pmic max77620 reset reason

[0000.143] pmic max77620 NVERC : 0x40

[0000.146] RamCode = 0

[0000.149] Platform has DDR4 type RAM

[0000.152] max77620 disabling SD1 Remote Sense

[0000.156] Setting DDR voltage to 1125mv

[0000.160] Serial Number of Pmic Max77663: 0x404c8

[0000.167] Entering ramdump check

[0000.170] Get RamDumpCarveOut = 0x0

[0000.174] RamDumpCarveOut=0x0, RamDumperFlag=0xe59ff3f8

[0000.179] Last reboot was clean, booting normally!

[0000.183] Sdram initialization is successful

[0000.188] SecureOs Carveout Base=0x00000000ff800000 Size=0x00800000

[0000.194] Lp0 Carveout Base=0x00000000ff780000 Size=0x00001000

[0000.199] BpmpFw Carveout Base=0x00000000ff700000 Size=0x00080000

[0000.205] GSC1 Carveout Base=0x00000000ff600000 Size=0x00100000

[0000.211] GSC2 Carveout Base=0x00000000ff500000 Size=0x00100000

[0000.217] GSC4 Carveout Base=0x00000000ff400000 Size=0x00100000

[0000.223] GSC5 Carveout Base=0x00000000ff300000 Size=0x00100000

[0000.229] GSC3 Carveout Base=0x000000017f300000 Size=0x00d00000

[0000.245] RamDump Carveout Base=0x00000000ff280000 Size=0x00080000

[0000.251] Platform-DebugCarveout: 0

[0000.254] Nck Carveout Base=0x00000000ff080000 Size=0x00200000

[0000.260] Non secure mode, and RB not enabled.

[0000.375] Csd NumOfBlocks=123486208

[0000.380] Set High speed to 1

[0000.387] Using GPT Primary to query partitions

[0000.392] Loading Tboot-CPU binary

[0000.402] Verifying TBC in OdmNonSecureSBK mode

[0000.412] Bootloader load address is 0xa0000000, entry address is 0xa0000258

[0000.419] Bootloader downloaded successfully.

[0000.423] Downloaded Tboot-CPU binary to 0xa0000258

[0000.428] MAX77620_GPIO5 configured

[0000.431] CPU power rail is up

[0000.434] Invalid Oscillator Freq


Is there anyone can help? Thanks

Please try to flash with sdkmanager.

These issue does not always happened. We tried to power on/off system many times, it sometimes happened.

I still suggest you could replace other sdcard or flash the board again with sdkmanager.