Happened in our network on 3850-48p-FS switch running 16.6.4a code, TAC told to upgrade to current gold star version Fuji.

I did code upgrades on  c3850edge switches from 3.6.6E to 16.6.4a. The upgrade went well & all switches in stack are running 16.6.4a but they kept reloading every 5-10mins.after checking logs found as below : *** Stack cable authentication failed for...