The VC audio need to be set as line input and not as mic input. Setting the VC audio to be mic input makes AEC to be applied to VC input audio and makes the audio fluctuate.
Try disconnecting everything from the DSP and leaving it unplugged from the power for at least 30 minutes. Then plug it back in to just the power, leaving everything else disconnected. If it starts back up normally, reconnect everything again and ...
Connect the DSP to telnet through USB(169.254.99.202) or through LAN(user defined IP Address) at port 23.Use username:clearone,Password:converge.Enter "FACTORYDEFAULT" to factory reset the DSP.
If the password has been forgotten, the DSP needs to be factory reset through with the serial port as the serial port does not require a username/password. Connect through serial port (Baudrate:57600) to the DSP and send FACTORYDEFAULT * or Letter ...