Also tried a different power supply rated up to 2 amps. The power-fail restarts are me moving it closer to the AP and back to its original location.
** Restart **
SD initialized.
3/27/24 00:45:29z Real Time Clock is running. Unix time 1711500329
3/27/24 00:45:29z Reset Reason: Power-fail restart.
3/27/24 00:45:29z ESP8266 ID: 563601, RTC M41T81 (68)
3/27/24 00:45:29z IoTaWatt 5.0, Firmware version 02_08_03
3/27/24 00:45:29z SPIFFS mounted.
3/26/24 18:45:29 Local time zone: -7:00, using DST/BST when in effect.
3/26/24 18:45:29 device name: IotaWatt
3/26/24 18:45:32 Connecting with WiFiManager.
3/26/24 18:45:37 HTTP server started
3/26/24 18:45:37 WiFi connected. SSID=MirkwoodIoT, IP=192.168.40.211, channel=1, RSSI -61db
3/26/24 18:45:37 timeSync: service started.
3/26/24 18:45:37 statService: started.
3/26/24 18:45:37 Updater: service started. Auto-update class is NONE
3/26/24 18:45:37 dataLog: service started.
3/26/24 18:45:37 dataLog: New current log created.
3/26/24 18:46:44 historyLog: service started.
3/26/24 18:46:44 historyLog: first entry 03/26/24 18:46:00
** Restart **
SD initialized.
3/27/24 00:54:11z Real Time Clock is running. Unix time 1711500851
3/27/24 00:54:11z Reset Reason: Power-fail restart.
3/27/24 00:54:11z ESP8266 ID: 563601, RTC M41T81 (68)
3/27/24 00:54:11z IoTaWatt 5.0, Firmware version 02_08_03
3/27/24 00:54:11z SPIFFS mounted.
3/26/24 18:54:11 Local time zone: -7:00, using DST/BST when in effect.
3/26/24 18:54:11 device name: IotaWatt
3/26/24 18:54:14 Connecting with WiFiManager.
3/26/24 18:54:19 HTTP server started
3/26/24 18:54:19 WiFi connected. SSID=MirkwoodIoT, IP=192.168.40.211, channel=1, RSSI -64db
3/26/24 18:54:19 timeSync: service started.
3/26/24 18:54:19 statService: started.
3/26/24 18:54:19 Updater: service started. Auto-update class is NONE
3/26/24 18:54:19 dataLog: service started.
3/26/24 18:54:19 dataLog: Last log entry 03/26/24 18:53:15
3/26/24 18:54:24 historyLog: service started.
3/26/24 18:54:24 historyLog: Last log entry 03/26/24 18:53:00
** Restart **
SD initialized.
3/27/24 01:44:43z Real Time Clock is running. Unix time 1711503883
3/27/24 01:44:43z Reset Reason: Power-fail restart.
3/27/24 01:44:43z ESP8266 ID: 563601, RTC M41T81 (68)
3/27/24 01:44:43z IoTaWatt 5.0, Firmware version 02_08_03
3/27/24 01:44:43z SPIFFS mounted.
3/26/24 19:44:44 Local time zone: -7:00, using DST/BST when in effect.
3/26/24 19:44:44 device name: IotaWatt
3/26/24 19:44:47 Connecting with WiFiManager.
3/26/24 19:44:57 HTTP server started
3/26/24 19:44:57 WiFi connected. SSID=MirkwoodIoT, IP=192.168.40.211, channel=1, RSSI -73db
3/26/24 19:44:57 timeSync: service started.
3/26/24 19:44:58 statService: started.
3/26/24 19:44:58 Updater: service started. Auto-update class is NONE
3/26/24 19:44:59 dataLog: service started.
3/26/24 19:44:59 dataLog: Last log entry 03/26/24 19:44:35
3/26/24 19:45:03 historyLog: service started.
3/26/24 19:45:03 historyLog: Last log entry 03/26/24 19:44:00
3/26/24 19:49:42 Updater: release file header invalid. é@œò@
3/26/24 19:50:04 Updater: download/02_08_02.bin.bin not found
** Restart **
SD initialized.
3/27/24 02:00:52z Real Time Clock is running. Unix time 1711504852
3/27/24 02:00:52z Reset Reason: Power-fail restart.
3/27/24 02:00:52z ESP8266 ID: 563601, RTC M41T81 (68)
3/27/24 02:00:52z IoTaWatt 5.0, Firmware version 02_08_03
3/27/24 02:00:52z SPIFFS mounted.
3/26/24 20:00:53 Local time zone: -7:00, using DST/BST when in effect.
3/26/24 20:00:53 device name: IotaWatt
3/26/24 20:00:56 Connecting with WiFiManager.
3/26/24 20:01:02 HTTP server started
3/26/24 20:01:02 WiFi connected. SSID=MirkwoodIoT, IP=192.168.40.211, channel=1, RSSI -72db
3/26/24 20:01:02 timeSync: service started.
3/26/24 20:01:03 statService: started.
3/26/24 20:01:03 Updater: service started. Auto-update class is NONE
3/26/24 20:01:03 dataLog: service started.
3/26/24 20:01:03 dataLog: Last log entry 03/26/24 20:00:45
3/26/24 20:01:08 historyLog: service started.
3/26/24 20:01:08 historyLog: Last log entry 03/26/24 20:00:00
** Restart **
SD initialized.
3/29/24 00:56:56z Real Time Clock is running. Unix time 1711673816
3/29/24 00:56:56z Reset Reason: Power-fail restart.
3/29/24 00:56:56z ESP8266 ID: 563601, RTC M41T81 (68)
3/29/24 00:56:56z IoTaWatt 5.0, Firmware version 02_08_03
3/29/24 00:56:56z SPIFFS mounted.
3/28/24 18:56:56 Local time zone: -7:00, using DST/BST when in effect.
3/28/24 18:56:56 device name: IotaWatt
3/28/24 18:56:59 Connecting with WiFiManager.
3/28/24 18:57:03 HTTP server started
3/28/24 18:57:04 WiFi connected. SSID=MirkwoodIoT, IP=192.168.40.211, channel=1, RSSI -72db
3/28/24 18:57:04 timeSync: service started.
3/28/24 18:57:04 statService: started.
3/28/24 18:57:04 Updater: service started. Auto-update class is NONE
3/28/24 18:57:04 dataLog: service started.
3/28/24 18:57:04 dataLog: Last log entry 03/28/24 18:56:45
3/28/24 18:57:09 historyLog: service started.
3/28/24 18:57:09 historyLog: Last log entry 03/28/24 18:56:00