2008 Vauxhall Astra 1.3CDTI - Intermittent Fault horn, central locking, power - mickeybo

I have this car 1 year, then the horn and central locking start'd playing up (lock presion). This is a intermittent fault, the car take's its notions it works fine for at least 1 day out of 3 weeks!

I also notice'd lack of power loss (turbo boost) when going up hill, but when this fault is not thier the car run's fine! pulls the hill no bother and horn - central locking works fine also.

Anybody had the same problem before? or somebody shead a bit of light on this would be great.

Thanks, MickeyBo