rtl8821ae does not communicate at 5.0GHz

My Asus AMD 5200 series machine has a rtl8821ae chipset for wlan network communications. Under Unbuntu 16.04, I can connect at either 2.4 or 5.0 GHz, but only 2.4 actually works. I should point out that at 5.0 gets an IP address (ifconfig) and has a solid connection. Having read a few of the answers I imagine it is either a simple setting or a new file to modprobe.

Kernel: 4.4.0.28
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$ sudo lshw (rtl8821ae only)
        *-pci:4
             description: PCI bridge
             product: SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
             vendor: Advanced Micro Devices, Inc. [AMD/ATI]
             physical id: 15
             bus info: pci@0000:00:15.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:20 ioport:d000(size=4096) memory:fe700000-fe7fffff
           *-network
                description: Wireless interface
                product: RTL8821AE 802.11ac PCIe Wireless Network Adapter
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:05:00.0
                logical name: wlp5s0
                version: 00
                serial: dc:85:de:c5:48:95
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=rtl8821ae driverversion=4.4.0-28-generic firmware=N/A ip=192.168.3.103 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
                resources: irq:46 ioport:d000(size=256) memory:fe700000-fe703fff

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$ sudo lspci -vv -s 05:00.0
05:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter
        Subsystem: AzureWave RTL8821AE 802.11ac PCIe Wireless Network Adapter
        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 46
        Region 0: I/O ports at d000 [size=256]
        Region 2: Memory at fe700000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee0200c Data: 4164
        Capabilities: [70] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <64us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR+, OBFF Via message/WAKE#
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis+, LTR-, OBFF Disabled
                LnkCtl2: Target Link Speed: 2.5GT/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 v2] 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: [140 v1] Device Serial Number 00-e0-4c-ff-fe-87-2b-01
        Capabilities: [150 v1] Latency Tolerance Reporting
                Max snoop latency: 0ns
                Max no snoop latency: 0ns
        Capabilities: [158 v1] L1 PM Substates
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
                          PortCommonModeRestoreTime=150us PortTPowerOnTime=150us
        Kernel driver in use: rtl8821ae
        Kernel modules: rtl8821ae