Both my wife and I have Forerunner 235 watches and we use Livetrack to keep up with each other when we are out running. recently we loose connection between our watches and our iPhones almost every run. It appears that the Garmin Connect app is closing during the run rather than staying open for Livetrack to work.
both phones iPhone SE iOS 12.3.1 app 4.22.1.1
watch 8.00 (add1891)
watch 7.90 (cf8d7e5)