RF Control RF SEQ IGNITE BIAS V LIMIT ( FET bias voltage limit reached but Ips 3672 mA ˂ 3700 mA ) ICP OES 5110

Hello 

Please i want know how can i repair this problem 

I find this message sometimes in my instrument not always , When this message appears plasma not ignite

I think there are a problem in RF supply , Is there any confirmation please ? 

Best regard