Dear supporter, Recently, my Cisco SF 300-24P PoE Managed Switch often up/down ports with below status: 2018-Dec-27 08:55:49 Warning %STP-W-PORTSTATUS: fa15: STP status Forwarding 2018-Dec-27 08:55:47 Warning %STP-W-PORTSTATUS: fa19: STP status Forw...