Citroen Xantia Radio problem

[gordons]

I have recently purchased a 1998 Citroen Xantia fitted with a 4035 RDS Audio System which has a problem as follows:

1. The radio will ONLY work if the on/off and the BND buttons are depressed simultaneously, it will NOT work using the on/off button alone
2. When working stations change ok and volume controls are fine but the radio emits a constant beeping sound
3. After running for only a few minutes the radio switches itself off.

Any advice on solving this problem would be appreciated.
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Gordon Stamp