The bug here states that when a stack of 3850 connected to 4500x over a 10G etherhcannel we can confirm that my symptoms fall in line with this bug. I do not have a 4500 chassis connected to this switch. Moreover the affected release here is 16.3.2 but our switch is operational on 16.3.6 and the fix i believe is available on 16.3.5.
We have only one Etherchannel built over 2 1G ports connecting to another 3850. The fault type make me curious too, as per the bug it is wcm fault (Wireless controller Module, maybe) and in my case it is dbm fault
TBH-E-API-1-HUB-XA-1#sh etherchannel sum
<Output omitted>!!
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
6 Po6(SU) LACP Gi1/1/1(P) Gi1/1/2(P)
TBH-E-API-1-HUB-XA-1#sh cdp nei Gi1/1/1
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
TBH-E-PSB2-1-SR-XC-1
Gig 1/1/1 169 R S I WS-C3850- Ten 1/0/6
Total cdp entries displayed : 1
TBH-E-API-1-HUB-XA-1#sh cdp nei Gi1/1/2
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
TBH-E-PSB2-1-SR-XC-1
Gig 1/1/2 179 R S I WS-C3850- Ten 2/0/6
