Miflora devices stopped working, can be seen in bluetoothctl

Hi all,
Ive had a miflora device working perfectly for sometime now.
Recently it stopped reporting, even though I’ve changed the batteries and can see the device in bluetoothctl, I get no sensors output in hassio. I can also see the device is working properly in the xiaomi home app. My other bluetooth devices can be seen in homeassistant without issue.
All I get in the log is:

2019-06-15 12:05:44 WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.spruce_conductivity is taking over 10 seconds

I’m not sure if maybe a recent update to hassio has broken this. Could anyone advise?
Thanks,
Mat.