Increasing snmp timeout did not help.As I am curious I deleted one of those devices from Catalyst Center and brought this brownfield device in again after a while. That seems to work (until today it is still manageable). But what a manual effort to d...

Oh I forgot: I also checked whether those devices have a diff between startup and running   => no they don't have a diff

Concerned Version:  2.3.7.10.70209.10, all kinds of catalyst switches, in completely different hierarchy aereas (and also different aereas of the country), but always the same few devicesWhat we tried:"clicking devices green" (validate credentials ->...