Interface up down

Hi All,

One of our HP V1910-16G  Gig 1/0/1 interface going down for few sceonds at same time and we are not able to identify a possible cause :

%Mar 8 20:21:06:612 2002 V1910-16G IFNET/4/LINK UPDOWN: GigabitEthernet1/0/1: link status is DOWN
%Mar 8 20:21:09:158 2002 V1910-16G IFNET/4/LINK UPDOWN: GigabitEthernet1/0/1: link status is UP

5.20 Release 1111P02