I have a small office with (4) GXP2160 endpoints connected to a UCM-6104 PBX. Recently the local call recording feature was enabled with default storage to USB Flash drives plugged into the back of each endpoint.
I have been made aware now several times, and personally experienced also that during extended calls where the user has activated a local recording (sometimes after 5 to 15 minutes of being on the call) that the call will abruptly fail.
The user suddenly experiences no sound and the call is disconnected. The display gives a warning message about “CSS Error” and the phone will not give a dial tone or receive inbound calls until it is rebooted, although the UI continues to be otherwise responsive through soft buttons and menus.
The phones experiencing this issue so far have been updated to firmware 184.108.40.206 although I can’t see if the issue is related directly to that release because the feature was not enabled until after the latest firmware was update.
Please let me know if this is a known issue, or if there is any additional troubleshooting or information I can provide to help with resolution!