Excessive total output drops coming from 3650 uplink. Where to start?

This is the configuration on the interface:

sh int xxx x/x/x

xxxxxx is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is xxxxx (xxxxxx) Description: UPLINK to xxxxx MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 10/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000BaseTX SFP input flow-control is on, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:27, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 5xxxxxxxxx

I don’t even know where to start, but on the adjacent link, FIFO queuing is in place.