Auto-negotiation issue on FE/GE interfaces can cause packet loss on both sides, and the FIFO error statistics are increasing, as shown with show interface ge-x/x/x extensive

Sometimes packet loss may be observed on ethernet interfaces, even when the interface is not congested. By using "show interface ge-x/x/x extensive", the MAC FIFO error statistics are increasing on the interface:

lab@router> show interfaces extensive fe-0/0/0  
Physical interface: fe-0/0/0, Enabled, Physical link is Up
Interface index: 128, SNMP ifIndex: 79, Generation: 11
Description: coloc uplink
Link-level type: Ethernet, MTU: 1518, Speed: 100mbps, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled
<...>
  MAC statistics:                      Receive         Transmit
    Total octets                    9385473299      20196564932
    Total packets                     17112044            21398
    Unicast packets                   16888990         42696389
    Broadcast packets                   158996           401151
    Multicast packets                    64059             4121
    CRC/Align errors                         0                0 
    FIFO errors                              0            43518
    MAC control frames                       0                0
    MAC pause frames                         0                0
    Oversized frames                         0
    Jabber frames                            0
    Fragment frames                          0
    VLAN tagged frames                       0
    Code violations                          0

   Autonegotiation information:
      Negotiation status: No-autonegotiation, Link partner status: Ok, Link partner: Unknown, Flow control: None

root@lab# run ping xxxxxx rapid count 1000
PING xxxxxx (xxxxxx): 56 data bytes
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!.!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!.!!!!!!
!!!!.!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!.!!!!!!!!!!
--- xxxxxx ping statistics ---
1000 packets transmitted, 983 packets received, 1% packet loss
round-trip min/avg/max/stddev = 0.470/0.955/15.911/1.691 ms

In the JUNOS documentation, an increase in the MAC FIFO error statistics is documented as a "probable" hardware issue:

FIFO error—Number of FIFO errors that are reported by the ASIC on the PIC. If this value is ever nonzero, the PIC is probably malfunctioning.

link-mode full-duplex;
gigether-options {
    no-auto-negotiation;
}

lab@m10i-re0# show interfaces fe-1/1/0
speed 100m;
link-mode full-duplex;