BCM - CDT Error

Hello, everyone,

We use SAP BCM version 7.0.9.0 in our company, with which we and our employees make phone calls.
However, 4-5 times a day the connection to the CDT breaks off and the BCM "freezes" at the colleagues and they then have to restart the CDT.

Here is a section of a log where this error occurred.

08:24:54.797 (05404 ) ERR> AUDIO[VOL] SystemMixerManager::ReOpen => Unable to open mixers!!!
09:27:01.279 (03340/CEMProxy ) ERR> CEM[IN] Connection to CEM lost!!
09:28:07.719 (06464/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06464/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06460/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06464/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06460/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06456/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06456/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:07.719 (06464/IpcWorker ) ERR> SNET[IN] Incoming channel message to channel, that is not available, ignoring
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] Control::GetValue (Name = 'Lautstärke', ControlID = 4, Channels = 1, Error 6:)
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] Control::GetValue Error Str: MMSYSERR_NODRIVER
09:28:08.929 (06288/PhoneImpl ) ERR> PHONE[run] VOLUME MICROPHONE level get error -> Invalidate microphone volume controller
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] MIC SystemMixerManager::OpenMixers => mixerGetID(0, 0, 20000000) = 'MMSYSERR_BADDEVICEID'
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] MIC SystemMixerManager::OpenMixers => Recording Mixer opening failed.. Error = MMSYSERR_BADDEVICEID
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] SPKR SystemMixerManager::OpenMixers => [OUT] mixerGetID(0, 0, 10000000) = 'MMSYSERR_BADDEVICEID'
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] SPKR SystemMixerManager::OpenMixers => Playback Mixer opening failed.. Error = 'MMSYSERR_BADDEVICEID'
09:28:08.929 (06288/PhoneImpl ) ERR> AUDIO[VOL] SystemMixerManager::ReOpen => Unable to open mixers!!!
09:28:36.496 (06464/IpcWorker ) ERR> CEM[IN] Connection to CEM lost!!
09:30:20.628 (06288/PhoneImpl ) ERR> PHONE[run] heartbeat has not been answered - closing
09:35:08.262 (05404 ) ALW> Set safety exit to 10 seconds
09:35:08.262 (06240/WatchdogThread) ALW> Watchdog: Application instance stopped

The Windows Firewall was deactivated via GPO
As an anti-virus solution we use Panda
We use Plantronics DA40 and DA70 headsets

Thank you

Peter Graefen