Scratch that. Checked the logs and it happened again yesterday while I was away.
I am hoping this is a driver issue fixed in the updated bcmdhd driver in the 384 GPL. I am also curious if in 380.69/69_2 perhaps they may have been an undocumented driver update/change that would tie it all together.
Feb 8 11:21:52 kernel: dhdpcie_checkdied: msgtrace address : 0x00000000
Feb 8 11:21:52 kernel: console address : 0x003FFCF0
Feb 8 11:21:52 kernel: Assrt not built in dongle
Feb 8 11:21:52 kernel: TRAP type 0x4 @ epc 0x27c408, cpsr 0x280001d3, spsr 0x280001f2, sp 0x2aacac, lp 0x33f7b, rpc 0x27c408
Feb 8 11:21:52 kernel: Trap offset 0x2aac54, r0 0x200968, r1 0x4, r2 0x2008ec, r3 0x0, r4 0x4, r5 0x0, r6 0x3bd600, r7 0x280001d2
Feb 8 11:21:54 kernel: dhd_detach(): thread:dhd_watchdog_thread:24fe terminated OK
Feb 8 11:21:54 kernel: dhd_detach(): thread:dhd_watchdog_thread:24f7 terminated OK
Feb 8 11:21:54 kernel: dhd_detach(): thread:dhd_watchdog_thread:24f1 terminated OK
Feb 8 11:21:58 kernel: PCI_PROBE: bus 3, slot 0,vendor 14E4, device 4365(good PCI location)
Feb 8 11:21:59 kernel: dhd_attach(): thread:dhd_watchdog_thread:6003 started
Feb 8 11:21:59 kernel: Dongle Host Driver, version 1.363.45.58013 (r651509)
Feb 8 11:21:59 kernel: Compiled in drivers/net/wireless/bcmdhd on Jun 15 2017 at 14:50:24
Feb 8 11:21:59 kernel: Register interface [eth1] MAC: xx:xx:xx:xx:xx:c0
Feb 8 11:21:59 kernel: PCI_PROBE: bus 4, slot 0,vendor 14E4, device 4365(good PCI location)
Feb 8 11:21:59 kernel: dhd_attach(): thread:dhd_watchdog_thread:6009 started
Feb 8 11:22:00 kernel: Dongle Host Driver, version 1.363.45.58013 (r651509)
Feb 8 11:22:00 kernel: Compiled in drivers/net/wireless/bcmdhd on Jun 15 2017 at 14:50:24
Feb 8 11:22:00 kernel: Register interface [eth2] MAC: xx:xx:xx:xx:xx:c4
Feb 8 11:22:00 kernel: PCI_PROBE: bus 1, slot 0,vendor 14E4, device 4365(good PCI location)
Feb 8 11:22:00 kernel: dhd_attach(): thread:dhd_watchdog_thread:600f started
Feb 8 11:22:00 kernel: Dongle Host Driver, version 1.363.45.58013 (r651509)
Feb 8 11:22:00 kernel: Compiled in drivers/net/wireless/bcmdhd on Jun 15 2017 at 14:50:24
Feb 8 11:22:00 kernel: Register interface [eth3] MAC: xx:xx:xx:xx:xx:c8
Feb 8 11:22:01 kernel: IGMP Query send failed
Feb 8 11:22:01 kernel: IGMP Query send failed