I checked physical and it doesn't seem like layer 1. I don't see any errors on the interface.
Here are the outputs. I really think it has something to do with Qos for some reason.
#test cab tdr int g3/28
#show cab td
#show cab tdr int g3/28
Interface Speed Local pair Cable length Remote channel Status
Gi4/5 1Gbps 1-2 54 +/-1m Unknown Open
3-6 53 +/-1m Unknown Open
4-5 54 +/-1m Unknown Open
7-8 54 +/-1m Unknown Open
Port Broadcast Multicast Level TotalSuppressedPackets
Gi4/ 5Enabled Disabled 1.00% 0
GigabitEthernet4/5 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 3435.7374.3c5b (bia 3435.7374.3c5b)
Description: B1 F4 User Vlan 100
MTU 1500 bytes, BW 1000000 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 10/100/1000-TX
input flow-control is on, output flow-control is on
Auto-MDIX on (operational: on)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:30, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 119369
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 6000 bits/sec, 5 packets/sec
204565655 packets input, 90406806812 bytes, 0 no buffer
Received 2182854 broadcasts (1568304 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
1001389137 packets output, 880251559573 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
