[FS#896] mt7620 - dropping frames (WiFi)

[LEDE Bugs]

The following task has a new comment added:

FS#896 - mt7620 - dropping frames (WiFi)
User who did this - kofec (kofec)

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in my case, the latest good version was:
(gcc version 5.4.0 (LEDE GCC 5.4.0 r5049-e53bdcb)
after that it iw worst. Especially latest one
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=896#comment4148