I am getting these errors on my machine for an external USB connection.

Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: ERROR Transfer event for unknown stream ring slot 4 ep 3
Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: @00000020155b24c0
00000000 00000000 1a001000 04048001
Apr 8 13:23:55 devgeis kernel: sd 7:0:0:0: [sdd] tag#3
uas_eh_abort_handler 0 uas-tag 4 inflight: CMD OUT
Apr 8 13:23:55 devgeis kernel: sd 7:0:0:0: [sdd] tag#3 CDB: Write(10) 2a
00 35 b8 db ff 00 04 00 00
Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: ERROR Transfer event for unknown stream ring slot 4 ep 3
Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: @00000020155b24e0
00000000 00000000 1a001000 04048001
Apr 8 13:23:55 devgeis kernel: sd 7:0:0:0: [sdd] tag#2
uas_eh_abort_handler 0 uas-tag 3 inflight: CMD OUT
Apr 8 13:23:55 devgeis kernel: sd 7:0:0:0: [sdd] tag#2 CDB: Write(10) 2a
00 35 b8 d7 ff 00 04 00 00
Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: ERROR Transfer event for unknown stream ring slot 4 ep 3
Apr 8 13:23:55 devgeis kernel: xhci_hcd 0000:b3:00.0: @00000020155b2500
00000000 00000000 1a001000 04048001
Apr 8 13:23:55 devgeis kernel: sd 7:0:0:0: [sdd] tag#1
uas_eh_abort_handler 0 uas-tag 2 inflight: CMD OUT

The device is a Crucial MX300 SSD 2T disk. I ran badblocks on it and nothing was reported.

Why might I be getting errors ?

Jerry