Jails randomly losing network connectivity

[Stranded Camel]

I'm using TrueNAS Core 12.0 U8. Starting about a month ago, and with increasing frequency, my three jails would lose all connectivity occasionally. I could ssh into them from the LAN, but I couldn't ping out from the jails at all -- neither to URLs (e.g. google.com) nor to IP addresses (e.g. 8.8.8.8).

When this happens, the only way I can get the jails network connectivity back is by rebooting the entire server.

Also, when this happens, my bhyve virtual machine continues to work perfectly well, with full connectivity, as does the server itself.

I don't know where to even begin to troubleshoot this.

Logs:

Code:

intsmb0: <AMD FCH SMBus Controller> at device 20.0 on pci0
smbus0: <System Management Bus> on intsmb0
lo0: link state changed to UP
AMD-Vi: IVRS Info VAsize = 64 PAsize = 48 GVAsize = 2 flags:0
ivhd0: <AMD-Vi/IOMMU ivhd with EFR> on acpi0
ivhd0: Flag:b0<IotlbSup,Coherent>
ivhd0: Features(type:0x11) MsiNumPPR = 0 PNBanks= 2 PNCounters= 0
ivhd0: Extended features[31:0]:22294ade<PPRSup,<b2>,NXSup,GTSup,IASup> HATS = 0x2 GATS = 0x0 GLXSup = 0x1 SmiFSup = 0x1 SmiFRC = 0x2 GAMSup = 0x1 DualPortLogSup = 0x2 DualEventLogSup = 0x2
ivhd0: Extended features[62:32]:58f77ef<USSup> Max PASID: 0x2f DevTblSegSup = 0x3 MarcSup = 0x1
ivhd0: supported paging level:7, will use only: 4
ivhd0: device range: 0x0 - 0xffff
ivhd0: PCI cap 0x190b640f@0x40 feature:19<IOTLB,EFR,CapExt>
em0: link state changed to UP
hwpmc: SOFT/16/64/0x67<INT,USR,SYS,REA,WRI> TSC/1/64/0x20<REA> K8/16/48/0x1ff<INT,USR,SYS,EDG,THR,REA,WRI,INV,QUA>
em0: link state changed to DOWN
CPU: AMD Ryzen 7 3800X 8-Core Processor              (3892.77-MHz K8-class CPU)
  Origin="AuthenticAMD"  Id=0x870f10  Family=0x17  Model=0x71  Stepping=0 Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT> Features2=0x7ed8320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD Features2=0x75c237ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX,<b30>>
  Structured Extended Features=0x219c91a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,PQM,PQE,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,SHA>
  Structured Extended Features2=0x400004<UMIP,RDPID>
  XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
  AMD Extended Feature Extensions ID EBX=0x10cb657<CLZERO,IRPerf,XSaveErPtr>
  SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768
  TSC: P-state invariant, performance statistics
nfsd: can't register svc name
Security policy loaded: MAC/ntpd (mac_ntpd)
em0: link state changed to UP
nfsd: can't register svc name
bridge0: Ethernet address: xx:xx:xx:xx:xx:xx
epair0a: Ethernet address: xx:xx:xx:xx:xx:xx
epair0b: Ethernet address: xx:xx:xx:xx:xx:xx
epair0a: link state changed to UP
epair0b: link state changed to UP
epair0a: changing name to 'vnet0.1'
em0: link state changed to DOWN
bridge0: link state changed to UP
em0: promiscuous mode enabled
vnet0.1: promiscuous mode enabled
lo0: link state changed to UP
em0: link state changed to UP
epair1a: Ethernet address: xx:xx:xx:xx:xx:xx
epair1b: Ethernet address: xx:xx:xx:xx:xx:xx
epair1a: link state changed to UP
epair1b: link state changed to UP
epair1a: changing name to 'vnet0.2'
epair1b: changing name to 'epair0b'
vnet0.2: promiscuous mode enabled
lo0: link state changed to UP
tap0: Ethernet address: xx:xx:xx:xx:xx:xx
tap0: changing name to 'vnet0'
vnet0: promiscuous mode enabled
vnet0: link state changed to UP
epair2a: Ethernet address: xx:xx:xx:xx:xx:xx
epair2b: Ethernet address: xx:xx:xx:xx:xx:xx
epair2a: link state changed to UP
epair2b: link state changed to UP
epair2a: changing name to 'vnet0.3'
epair2b: changing name to 'epair0b'
lo0: link state changed to UP
pid 4420 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 7672 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 9694 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 9747 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 9835 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 10203 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 10847 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 11381 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 11806 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 11934 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 11964 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 13292 (Plex Media Server), jid 2, uid 972: exited on signal 6
pid 13709 (Plex Media Server), jid 2, uid 972: exited on signal 6