Thanks for the response
IoTaWatt 4.x, Firmware version 02_05_02
logs either side of the event:
2/21/20 22:42:55z Real Time Clock is running. Unix time 1582324975
2/21/20 22:42:55z Reset reason: Software/System restart
2/21/20 22:42:56z Trace: 1:3, 1:4, 1:5[7], 7:0, 7:9, 1:6, 1:1[1], 1:2[2], 9:0[2], 9:0, 9:1, 8:4, 8:6, 8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[7], 7:0, 7:9, 1:6, 1:3, 1:4, 1:5[21], 21:0, 21:1, 21:10, 21:10
2/21/20 22:42:57z ESP8266 ChipID: 2518062
2/21/20 22:42:58z IoTaWatt 4.x, Firmware version 02_05_02
2/21/20 22:42:58z SPIFFS mounted.
2/21/20 22:43:00z Local time zone: +0:00
2/21/20 22:43:00z device name: JohnFitz
2/21/20 22:43:00z MDNS responder started for hostname JohnFitz
2/21/20 22:43:01z LLMNR responder started for hostname JohnFitz
2/21/20 22:43:02z HTTP server started
2/21/20 22:43:02z WiFi connected. SSID=DCSIXBH24, IP=192.168.8.184, channel=11, RSSI -71db
2/21/20 22:43:03z timeSync: service started.
2/21/20 22:43:06z statService: started.
2/21/20 22:43:07z Updater: service started. Auto-update class is MAJOR
2/21/20 22:43:08z dataLog: service started.
2/21/20 22:43:29z dataLog: Last log entry 02/21/20 22:42:50
2/21/20 22:43:29z Updater: Auto-update is current for class MAJOR.
2/21/20 22:43:30z influxDB: started, url=192.168.2.187:8086, db=JohnFitzFrm, interval=10
2/21/20 22:44:09z historyLog: service started.
2/21/20 22:44:19z historyLog: Last log entry 02/21/20 22:42:00
2/21/20 22:46:53z influxDB: Start posting at 02/21/20 22:34:50
2/27/20 10:57:00z dataLog: datalog WDT - restarting
** Restart **
SD initialized.
2/27/20 10:57:02z Real Time Clock is running. Unix time 1582801022
2/27/20 10:57:02z Reset reason: Software/System restart
2/27/20 10:57:03z Trace: 25:41, 25:42, 25:41, 25:50, 25:51, 25:53, 25:54, 25:60, 25:61, 25:61, 25:63, 25:55, 25:56, 25:41, 25:42, 25:41, 25:50, 25:51, 25:53, 25:54, 25:60, 25:61, 25:61, 25:64, 25:65, 25:55, 25:56, 25:41, 25:42, 25:41, 25:50, 25:51
2/27/20 10:57:05z ESP8266 ChipID: 2518062
2/27/20 10:57:05z IoTaWatt 4.x, Firmware version 02_05_02
2/27/20 10:57:05z SPIFFS mounted.
2/27/20 10:57:07z Local time zone: +0:00
2/27/20 10:57:07z device name: JohnFitz
2/27/20 10:57:08z MDNS responder started for hostname JohnFitz
2/27/20 10:57:09z LLMNR responder started for hostname JohnFitz
2/27/20 10:57:09z HTTP server started
2/27/20 10:57:10z WiFi connected. SSID=DCSIXBH24, IP=192.168.8.184, channel=11, RSSI -75db
2/27/20 10:57:11z timeSync: service started.
2/27/20 10:57:11z statService: started.
2/27/20 10:57:11z Updater: service started. Auto-update class is MAJOR
2/27/20 10:57:12z dataLog: service started.
2/27/20 10:57:31z dataLog: Last log entry 02/27/20 10:56:30
2/27/20 10:57:32z Updater: Auto-update is current for class MAJOR.
2/27/20 10:57:33z influxDB: started, url=xxxx, db=xxxx, interval=10
2/27/20 10:57:45z influxDB: Start posting at 02/27/20 10:56:30
2/27/20 10:58:12z historyLog: service started.
2/27/20 10:58:22z historyLog: Last log entry 02/27/20 10:56:00
2/27/20 11:08:15z dataLog: datalog WDT - restarting
thanks