I have been having an ongoing issue whereby I am able to 'turn on' the radio using the controls circled below, and the other button controls work, however I get no orange display and the steering wheel controls don't work. Every now and then I'll be driving and it will all turn on intermittently and the display will turn on. Sometimes the clock is wrong and the radio volume will jump up. Clearly some sort of connection or electrical issue, but has anybody else experience this, or could give me some guidance on what to check first in terms of a fix?

Pic stolen from a reddit thread for illustration, but mine is a 2010 Corsa D SE if that makes any difference.