Telephone - Insufficient Voltage

Hi

Having done a recent scan, came across the following error code. Have tried clearing it, but it's still there. Any ideas, phone works.

Address 77: Telephone (J412)       Labels:| 3C8-035-730-A.clb
   Part No SW: 3C8 035 730 C    HW: 3C8 035 730 C
   Component: Telefon       012 0822 
   Revision: --------    Serial number: 35909603500843
   Coding: 020100000100010000000000
   Shop #: WSC 33361 790 00999
   ASAM Dataset: EV_UHVPremi A02705
   ROD: EV_UHVPremi_A02.rod
   VCID: 234248432ABC4A52E0-8076

1 Fault Found:
13893632 - Function Restricted due to Insufficient Voltage
          U1400 00 [008] - -
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 3
                    Reset counter: 11
                    Mileage: 280681 km
                    Date: 2019.03.13
                    Time: 18:03:15