[FS#1362] kernel hangs unexpectedly on mt7621

[LEDE Bugs]

The following task has a new comment added:

FS#1362 - kernel hangs unexpectedly on mt7621
User who did this - Victor Zhestkov (vzhestkov)

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Mi R3g can perform soft reboot with no issues. There is no crashlog in /sys/kernel/debug
One more strange think with the hanging. Led is changing the color from blue to orange and back and blinking sometimes. Looks like it's rebooting, but  actually the only way to fix it plug out the power cord and turn it in back.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1362#comment4330