Thanks for the reply Borpin. I checked the old emonhub log & the entries just stopped at 12:28 on Jan 4th. No errors, the log just stopped. I checked the syslog and messages logs, but there was nothing to indicate what caused the issue. On Jan 7th at about 01:30, when I rebooted the system entries started to appear in a new emonhob log, but these seem to be related to initialisation. There were no data entries from emonTX until I shutdown the emonbase, pulled the power & put it back again. A few seconds later the log started to receive entries every 10 seconds or so. I think there may be a hardware issue. I’ll maybe open the box & have a look to see if there are any obvious loose connections or dry joints when I get time.