[FS#383] 1043nd: wifi instable after 5minutes

[LEDE Bugs]

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FS#383 - 1043nd: wifi instable after 5minutes
User who did this: Alexander Couzens (lynxis)
Task details edited:
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board: TL-WR1043ND [v1]
version: reboot-2823-g3e7b894

- connect one or multiple clients to wifi
- create some traffic e.g. speedtests
- connection disconnects after 2-3 minutes
- wifi is unusable until calling `wifi`
- looks like the ath9k hangs

attached files:
- dmesg
- logread
- disconnect at 21:21:05

offline available:
- tcpdump mon0 AP side
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=383