Error when i go on the motorway

Hi

I have 2 questions

1. when I drive down the motorway after an hours or so my Air Suspension becomes inactive but stays up so its ok , ABS light comes on too

And the Light on the switch with the arrows that point up/down comes on

when I park and lock the car then come back the fault has gone ,Going around town I have no problems

I get a Can Line Error in my diagnostics

anyone seen this


2. I want to replace/upgrade the original radio so can anyone recommend one a can replace it with so it connects to my CD player in the back


Hope I have explained this well lol

Model year?

Which diagnostics are you using?

I've just had the air suspension fault after changing the front ball joints on mine. Dash message was air susp inactive, hdc inactive and the abs/dsc dash lights were lit.
My problem was the tracking, steering wheel was off centre and the steering angle sensor was picking up that I shouldn't be turning left at high speed.
Unless you've just had work done on the front end and your steering wheel is off centre by about 45 degrees I'd be looking at the actual sensor but if the wheel is off centre, get the tracking done.