2007 Skoda Fabia interior electrics and radio cutting out

The interior electrics of my car keeps cutting out with no regular pattern. This has been happening since going over 45,000 miles. I thought it might be an indicator to get a service done on the car, which I had done last weekend. But the problem persists! The service station hooked my Skoda up to the computers and it said that there was nothing wrong. So when I got home and the electrics cut out while I was parallel parking I was most surprised.

The interior electrics (dash board and radio) typically cut out when I am driving less than 15mph and when I am manoeuvring so parallel parking at home or negotiating a roundabout (slowing down, shifting gears, and then speeding up). I don't lose control of the car, but the radio and the panel lights all go off, the car beeps 3 times and either the red ABS light comes on or the red exclamation light comes on and sometimes (5% of the time) I lose power steering so the yellow steering wheel light comes on.

For the second time this morning when I got into the car the radio refused to work - all the dials worked and the volume control said that it was super loud, but no sound was coming out. I put the car in neutral and restarted it and the radio came on.

Does anyone have any idea what could be the cause or the solution to this problem?

Thank you for your help!

Jennifer