Resolved! Cyclic timeout on the console port (mgmt / ethernet) - X690-48x-2q-4c
X690-48x-2q-4c ExtremeXOS version 22.6.1.4 Exactly every 15 minutes timeout appears on the mgmt (ethernet) port. No ping response, hangs up the connection. The switch to which the mgmt port is connected does not report breaks or problems with packets...