I am seeing this same issue on my system. Any help would be greatly appreciated. I am using Ubuntu 16.04 with the 4.15.0-88-generic kernel. I have seen it on both host controllers on the motherboard. 

Here is the  info for the host controllers.

00:14.0 USB controller [0c03]: Intel Corporation 200 Series/Z370 Chipset Family USB 3.0 xHCI Controller [8086:a2af] (prog-if 30 [XHCI])
        Subsystem: ASRock Incorporation Device [1849:a2af]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 32
        Region 0: Memory at 92f30000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [70] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
                Address: 00000000fee00278  Data: 0000
        Kernel driver in use: xhci_hcd


b3:00.0 USB controller [0c03]: ASMedia Technology Inc. Device [1b21:2142] (prog-if 30 [XHCI])
        Subsystem: ASRock Incorporation Device [1849:2142]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 33
        Region 0: Memory at fbe00000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [68] MSI-X: Enable+ Count=8 Masked-
                Vector table: BAR=0 offset=00002000
                PBA: BAR=0 offset=00002080
        Capabilities: [78] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME+
        Capabilities: [80] Express (v2) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <64ns, L1 <2us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 8GT/s, Width x2, ASPM L0s L1, Exit Latency L0s <2us, L1 unlimited
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 8GT/s, Width x2, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR+, OBFF Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
                LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+, LinkEqualizationRequest-
        Capabilities: [100 v1] Advanced Error Reporting
                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap- ChkEn-
        Capabilities: [200 v1] #19
        Capabilities: [300 v1] Latency Tolerance Reporting
                Max snoop latency: 0ns
                Max no snoop latency: 0ns
        Kernel driver in use: xhci_hcd


Here is the kernel logs around the issues.

ASMedia host controller

[79349.641660] xhci_hcd 0000:b3:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
[79349.641787] xhci_hcd 0000:b3:00.0: Looking for event-dma 000000067614d5e0 trb-start 000000067614d5f0 trb-end 000000067614d630 seg-start 000000067614d000 seg-end 000000067614dff0

Intel Host controller

[ 1155.942954] xhci_hcd 0000:00:14.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
[ 1155.942982] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943029] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943102] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943142] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943221] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943261] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943341] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943382] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1155.943462] xhci_hcd 0000:00:14.0: bad transfer trb length 16384 in event trb
[ 1199.812033] xhci_hcd 0000:00:14.0: bad transfer trb length 16332 in event trb
[ 1199.952143] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 1
[ 1199.952501] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000387c3da40 trb-start 0000000387c3da50 trb-end 0000000000000000 seg-start 0000000387c3d000 seg-end 0000000387c3dff0
[ 1199.952502] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000387c3da40 trb-start 00000003d44a8000 trb-end 00000003d44a8d70 seg-start 00000003d44a8000 seg-end 00000003d44a8ff0