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LM4950, oscillations at 1.25MHz

Other Parts Discussed in Thread: LM4950

Hi, 

I have a design that uses three LM4950 Audio amplifiers 2 in BTL,  1 SE. When prototyping the design by hand all functioned as expected. However I have constructed a complete PCB Layout for the design. On powering up all three amplifiers are know oscillating at 1.25MHz, I have checked all additional circuitry including supplies and they are all effectively "Clean". My main concern is the layout is effecting the design. I was wondering if anybody knows if the LM4950 is susceptible to this issue and any design tips for minimizing its impact. 

Thanks in advance.