I have a handful of users who are complaining about their apps becoming unresponsive and slow. I looked at their PCs, a couple of them show Event ID's in the event log that say the NIC lost connection to the network. So I log into the switches, 2
HP V1910-48G
connected with a Gbic, and I see these errors in the syslog. Any idea why this is happening and how to fix it or is it normal?

Mar 14 08:49:06:039 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/7 link status is DOWN.
Mar 14 08:41:55:306 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/7 has been set to forwarding state.
Mar 14 08:41:55:295 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/7 link status is UP.
Mar 14 08:41:44:955 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/7 link status is DOWN.
Mar 14 08:37:41:826 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/11 has been set to forwarding state.
Mar 14 08:37:41:814 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/11 link status is UP.
Mar 14 08:37:39:420 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/11 link status is DOWN.
Mar 14 08:37:21:678 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/11 has been set to forwarding state.
Mar 14 08:37:21:667 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/11 link status is UP.
Mar 14 08:26:53:043 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/24 has been set to forwarding state.
Mar 14 08:26:53:030 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/24 link status is UP.
Mar 14 08:26:49:114 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/24 link status is DOWN.
Mar 13 18:52:27:206 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/9 link status is DOWN.
Mar 13 18:23:41:949 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/4 has been set to forwarding state.
Mar 13 18:23:41:937 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/4 link status is UP.
Mar 13 18:23:40:213 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/4 link status is DOWN.
Mar 13 18:23:20:696 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/4 has been set to forwarding state.
Mar 13 18:23:20:685 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/4 link status is UP.
Mar 13 18:23:18:314 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/4 link status is DOWN.
Mar 13 18:14:17:082 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/11 link status is DOWN.
Mar 13 17:00:44:224 2014 MSTP Information MSTP_FORWARDING Instance 0's port GigabitEthernet1/0/24 has been set to forwarding state.
Mar 13 17:00:44:212 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/24 link status is UP.
Mar 13 17:00:42:526 2014 IFNET Error LINK_UPDOWN GigabitEthernet1/0/24 link status is DOWN.