I tried the new patch for wpa wpa2 ptk/gtk reinstallation vulnerability (https://github.com/espressif/ESP8266_NONOS_SDK/commit/b762ea222ee94b9ffc5e040f4bf78dd8ba4db596). It seems to result in reset wifi status periodically.
I set ESP8266 to STATION mode only. I can see the following abnormal messages periodically.
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ap_probe_send over, rest wifi status to disassoc
state: 5 -> 0 (1)
pm close 7
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
connected with ssid-xxxxx, channel 8
dhcp client start...
If I revert back to SDK 2.1.0, everything is working normally.