same behavior overnight with the configuration removed from HA. I have no other data sources attached. after a few hours, reboot. I forgot to mention, the sd card failed shortly after I received my unit. I had a fast sd card laying around so I replaced it and it came right up after copying files over.
** Restart **
SD initialized.
11/15/22 08:40:57z Real Time Clock is running. Unix time 1668501657
11/15/22 08:40:57z Reset reason: Software/System restart
11/15/22 08:40:57z Trace: 10:58, 25:20, 25:30, 25:31, 10:56, 25:1, 25:1[2], 25:1[3], 10:59, 1:3, 1:1[3], 1:2[4], 9:0[4], 9:0, 9:1, 8:4, 8:6, 8:8, 9:3, 9:5, 9:9, 1:3, 1:3, 1:6[1], 1:6[2], 1:6[3], 1:5[21], 1:6[4], 21:0, 21:1, 21:10, 21:10
11/15/22 08:40:57z ESP8266 ID: 15763464, RTC PCF8523 (68)
11/15/22 08:40:57z IoTaWatt 5.0, Firmware version 02_08_00
11/15/22 08:40:57z SPIFFS mounted.
11/15/22 03:40:57 Local time zone: -5:00, using DST/BST when in effect.
11/15/22 03:40:57 device name: IotaWatt
11/15/22 03:40:57 HTTP server started
11/15/22 03:40:57 timeSync: service started.
11/15/22 03:40:57 statService: started.
11/15/22 03:40:57 dataLog: service started.
11/15/22 03:40:57 dataLog: Last log entry 11/15/22 03:40:55
11/15/22 03:41:01 WiFi connected. SSID=**************, IP=192.168.0.62, channel=11, RSSI -58db
11/15/22 03:41:01 Updater: service started. Auto-update class is BETA
11/15/22 03:41:02 historyLog: service started.
11/15/22 03:41:02 historyLog: Last log entry 11/15/22 03:40:00
11/15/22 03:41:03 Updater: Auto-update is current for class BETA.
11/15/22 06:26:10 Heap memory has degraded below safe minimum, restarting.