sd card resize on first boot

[mk01]

the lines you removed were the defaults after fresh flash to SD ?
so 840/275/400 ? or just confirm it was stock img freshly restored to card.

what is the sdcard brand / class?

you are first confirmed case of HW not handling the modest overclock. standard (with lines removed from config,txt) the clocks are 700/250/400. 99% of all such problems, the middle one - core_freq - caused issues as it directly affects sd card timings.

you can try putting back into /boot/config.txt

Code:

arm_freq=840