Sending keepalive failed X time(s), will retry in 1000 ms

I have 8 M5stack Atom Lites, 4 of them with LD2420 radars, all but one work great. One started complaining. Any ideas why? This results in lost statuses (specifically, radar => off doesn’t arrive in HA).

UPDATE: Turns out, an Atom Lite just died on me, and the replacement one was defective.

[11:02:25][I][app:100]: ESPHome version 2024.6.6 compiled on Jul  8 2024, 23:51:59
[11:02:25][C][wifi:599]: WiFi:
[11:02:25][C][wifi:427]:   Local MAC: 24:A1:60:XX:XX:XX
[11:02:25][C][wifi:432]:   SSID: [redacted]
[11:02:25][C][wifi:435]:   IP Address: 192.168.40.206
[11:02:25][C][wifi:439]:   BSSID: [redacted]
[11:02:25][C][wifi:440]:   Hostname: 'radar_kitchen'
[11:02:25][C][wifi:442]:   Signal strength: -57 dB ▂▄▆█
[11:02:25][C][wifi:446]:   Channel: 11
[11:02:25][C][wifi:447]:   Subnet: 255.255.255.0
[11:02:25][C][wifi:448]:   Gateway: 192.168.40.1
[11:02:25][C][wifi:449]:   DNS1: 192.168.40.1
[11:02:25][C][wifi:450]:   DNS2: 0.0.0.0
[11:02:26][C][logger:185]: Logger:
[11:02:26][C][logger:186]:   Level: DEBUG
[11:02:27][C][logger:188]:   Log Baud Rate: 115200
[11:02:33][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:02:43][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 1 time(s), will retry in 1000 ms
[11:02:43][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 2 time(s), will retry in 1000 ms
[11:02:43][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 3 time(s), will retry in 1000 ms
[11:02:44][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 4 time(s), will retry in 1000 ms
[11:02:45][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 5 time(s), will retry in 1000 ms
[11:02:46][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 6 time(s), will retry in 1000 ms
[11:02:48][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 7 time(s), will retry in 1000 ms
[11:03:32][D][sensor:094]: 'WiFi Signal': Sending state -57.00000 dBm with 0 decimals of accuracy
[11:04:32][D][sensor:094]: 'WiFi Signal': Sending state -57.00000 dBm with 0 decimals of accuracy
[11:05:32][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:06:32][D][sensor:094]: 'WiFi Signal': Sending state -57.00000 dBm with 0 decimals of accuracy
[11:06:36][D][esp32_ble_tracker:270]: Starting scan...
[11:07:32][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:08:32][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:08:51][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 1 time(s), will retry in 1000 ms
[11:08:53][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 2 time(s), will retry in 1000 ms
[11:08:54][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 3 time(s), will retry in 1000 ms
[11:08:55][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 4 time(s), will retry in 1000 ms
[11:09:34][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:10:33][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:11:34][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:11:37][D][esp32_ble_tracker:270]: Starting scan...
[11:11:57][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 1 time(s), will retry in 1000 ms
[11:11:58][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 2 time(s), will retry in 1000 ms
[11:11:59][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 3 time(s), will retry in 1000 ms
[11:12:00][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 4 time(s), will retry in 1000 ms
[11:12:01][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 5 time(s), will retry in 1000 ms
[11:12:06][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 6 time(s), will retry in 1000 ms
[11:12:06][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 7 time(s), will retry in 1000 ms
[11:12:06][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 8 time(s), will retry in 1000 ms
[11:12:06][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 9 time(s), will retry in 1000 ms
[11:12:06][W][api.connection:143]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 10 time(s), will retry in 1000 ms
[11:12:32][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:13:34][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:14:11][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 1 time(s), will retry in 1000 ms
[11:14:11][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 2 time(s), will retry in 1000 ms
[11:14:11][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 3 time(s), will retry in 1000 ms
[11:14:13][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 4 time(s), will retry in 1000 ms
[11:14:13][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 5 time(s), will retry in 1000 ms
[11:14:48][D][sensor:094]: 'WiFi Signal': Sending state -58.00000 dBm with 0 decimals of accuracy
[11:15:15][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 1 time(s), will retry in 1000 ms
[11:15:16][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 2 time(s), will retry in 1000 ms
[11:15:17][D][api.connection:146]: Home Assistant 2024.5.5 (192.168.40.12): Sending keepalive failed 3 time(s), will retry in 1000 ms
[11:15:32][D][sensor:094]: 'WiFi Signal': Sending state -57.00000 dBm with 0 decimals of accuracy