More heavy network traffic leads to network break-down

[ericzolf]

Just to keep track of my progress somewhere:

1. it appears that the Nighthawk router reboots under too much load from my PBP
2. dmesg shows

```
[ 1829.142437] cw2015 4-0062: SoC stuck @0%, resetting gauge
[ 1846.637729] brcmfmac: brcmf_set_channel: set chanspec 0x100e fail, reason -52
[ 1846.638301] brcmfmac: brcmf_set_channel: set chanspec 0xd022 fail, reason -52
[ 1846.759211] brcmfmac: brcmf_set_channel: set chanspec 0xd026 fail, reason -52
[ 1846.877665] brcmfmac: brcmf_set_channel: set chanspec 0xd02a fail, reason -52
[ 1846.999882] brcmfmac: brcmf_set_channel: set chanspec 0xd02e fail, reason -52
[...]
[ 1927.883459] brcmfmac: brcmf_set_channel: set chanspec 0xd080 fail, reason -52
[ 1927.883993] brcmfmac: brcmf_set_channel: set chanspec 0xd084 fail, reason -52
[ 1927.884515] brcmfmac: brcmf_set_channel: set chanspec 0xd088 fail, reason -52
[ 1927.885056] brcmfmac: brcmf_set_channel: set chanspec 0xd08c fail, reason -52
[ 1927.885665] brcmfmac: brcmf_set_channel: set chanspec 0xd090 fail, reason -52
[ 1928.824979] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
```

(I don't think the cw2015 is there each time, the rest is common)

---

Similar reports searching for the set chanspec error:

1. https://forums.raspberrypi.com/viewtopic.php?t=350986 (similar issue on raspi4 but no answer)
2. https://forum.manjaro.org/t/problem-with...o/144144/5 (few hints, nothing conclusive)