Android auto loads on phone but black screen on car display

A

AC Question

So I have a Samsung Galaxy S5 stock and a Vauxhall Corsa (2016 model, in the UK)

It has the intellilink 4.0 system in it which I know supports android auto

Sometimes i will connect my phone and everything will work perfectly but other times android auto will load on my phone but the car will just display a black screen... I can't seem to establish what makes it work sometimes but fail other times...

For what it's worth, Apple car play (annoyingly) works flawlessly everytime...

Any suggestions would be appreciated...