About half of the time the TV turns on instantly from the Sky remote(just turning on the Sky Q box), Sony remote or via Alexa on the Sonos beam.

The rest of the time it will turn on with the Sony remote or by a long press on the Sky remote power button but takes just over a minute to turn on! It will not turn on by Alexa or other HDMI  devices.

when it takes a long time I get SONY then coloured dots which turn into Android.

Its as if it has been rebooted by a long press on the Sony remote.

it is completely random and is not affected by how it is turned off! It is running the latest firmware.

Any ideas?