Hello,
Faced with a problem on Mikrotik RB 941.
When we supply power to the devices, the ports spontaneously "up", while there is no physical connection.
We tried to pull out the device board for the test, we didn't find any physical damage or traces of factory defects.
We tried several times to reset the device to factory settings, change various firmware, it does not help (temporarily the ports down and then up again).
We tried to install different firmware via Netinstall, it didn't help
If someone faced such a problem, we were happy to discuss this issue.