Cisco SW 2960x Series Unexpected UpLinks Shutdown

Hi All,,
I really need help now guys. I have 8-2960x access switches that is connected to 2-3750x core switches. The uplinks of the 2960x switches will just shutdown unexpectedly even if i just followed the same and old switch configuration.
Here is my Uplink config of 1 of my access switch and core siwtch.
Access switch:
interface Port-channel1
switchport mode trunk
interface GigabitEthernet1/0/50
description "UP-LINK01"
switchport mode trunk
channel-group 1 mode desirable
interface GigabitEthernet1/0/52
description "UP-LINK02"
switchport mode trunk
channel-group 1 mode desirable
Core siwtch:
interface Port-channel2
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet2/0/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 2 mode desirable
interface GigabitEthernet2/0/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 2 mode desirable
Here is the stat:
#sh interfaces port-channel 1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is c472.9563.03b4 (bia c472.9563.03b4)
MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
I have tried setting both channels with duplex full but still shutdowns unexpectedly.
Your advise is much appreciated. I badly need help right now, my boss will be very agree if this issue will not be solved within the week.
Thanks (bow)

BUG Details
2960X: Link may go down randomly with GLC-T in uplinks
CSCur56395
Description
Symptom:
4 member etherchannel with all GLC-T between 2960X goes down on inserting a stack module with stack cable. "show idprom" gives the following error.
hulc_sfp_iic_intf_read_eeprom sfp _index 3 yeti_iic_read_retry fail
Also the stack module fails device authentication.
%ILET-1-DEVICE_AUTHENTICATION_FAIL: The FlexStack Module inserted in this switch may not have been manufactured by Cisco or with Cisco's authorization. If your use of this product is the cause of a support issue, Cisco may deny operation of the product, support under your warranty or under a Cisco technical support program such as Smartnet. Please contact Cisco's Technical Assistance Center for more information.
The issue may be seen without ether channel also.
Conditions:
When GLC-T or other SFPs are plugged into uplink ports
Workaround:
Power cycle the box
Further Problem Description:
The uplink may, at times, go link down without error. Following error will be thrown when reading idprom information after link down.
hulc_sfp_iic_intf_read_eeprom sfp _index 3 yeti_iic_read_retry fail
We may also see "%ILET-1-DEVICE_AUTHENTICATION_FAIL" error in few cases.

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