If your ONYX triggers to record without being on the phone, etc. and continuous to record you need to re-teach the VAD(Voice Activation Detection).
First use the TEACH function, make sure you follow the correct steps, else it cannot calculate the correct trigger values:
How do I teach USBClient 1.6 / ONYX2?If the TEACH function does not pick up the value to start/stop triggering correct, you will need to do a manual TEACH - refer to forum post:
How do I manually set the TEACH value?You can also refer to topic
My ONYX is not recording/records when not on a call