FS#3740 - MT7688 wireless signal disappears under heavy load

[openwrt-bot]

conan92:

Device: GL-MT300N-V2
CPU: MT7688
Openwrt Version: trunk(2021/4/14)

Steps:

1. install the firmware
2. modify /etc/config/wireless

config wifi-device 'radio0' option type 'mac80211' option channel '11' option hwmode '11g' option path 'platform/10300000.wmac' option htmode 'HT40' option disabled '0' option noscan '1'

config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'OpenWrt'
option encryption 'none'

3. restart network 4. PC connect GL-MT300N-V2's wifi 5. [Another Openwrt Router, with 'iperf3 -s'][LAN]--------[WAN][GL-MT300N-V2][WIFI]--------[PC, with 'iperf3 -c -R'] 6. Within 1 minutes, wifi signal disappears 7. no error appears in logread

Please fix it.