Affected Products:
Single-Function: CS820, CS827 and C6160
Multifunction: CX820, CX825, CX827, CX860, XC6152, XC6153, XC8155, XC8160 and XC8163

Issue Description:
Failure to receive faxes as a result of the MFP going into Power Save mode for an extended period of time.

Solution:
A firmware update addresses this issue.

You can first reboot the device or awaken the device to return fax functionality.

Check your printer's firmware level.
xref_Check_xreffor general instructions.
xref_Check_xref
Based on your device's existing firmware-code level, you can update to the firmware levels suggested below:
PP.032.095 (FW3.2.95), or lower
Update to PP.033.097 (FW3.3.97)
Above PP.##*.095, but below .113; it is likelyyou have a PE-released version of firmware.*PP.031.xx or PP.032.xx
Update to PE-firmware version xx.032.113 or above

Update firmware.
Badge Reader Does Not Work when Printer Is in Standby and Sleep Mode for general instructions.

Still Need Help?
Have the following available when calling Lexmark Technical Support;
Printer model(s)
Printer serial number
LEGACY ID: SO8305