Pi has stopped tracking

I've been using a RasPi with the official Flight Radar pi image since the new year and have been getting around 250 aircraft tracked per day. Last week, this fell to zero. I've rebooted the pi and checked connection etc but can't figure out what the problem is.

I started a new log file and rebooted the pi earlier - here's a sample: (edit - it won't accept my log file as it thinks it contains links. Here's a cut down version):

2019-01-26 19:07:00 | [reader][i]Connecting to DVBT receiver via (exe:///usr/bin/dump1090-mutability --raw)
2019-01-26 19:07:00 | [reader][i]Connected to the receiver, configuring
2019-01-26 19:07:00 | [reader][i]Configured, processing messages
2019-01-26 19:07:00 | [reader][i]Connection terminated
2019-01-26 19:07:00 | [main][i]Terminating child process 4188 with SIGTERM
2019-01-26 19:07:03 | [feed][n]ping 53
2019-01-26 19:07:04 | [feed][n]syncing stream result: 1


A minute or so after reboot it appears to settle into a regular connect to receiver/terminate process set of steps, and a ping every 30 seconds.

Is there anything clearly wrong here?

Thanks for the help.