Mikrotik RB2011iL-IN. The gigabit ports are not working, but the connection indicator is present

At first, it was working fine. After some time, the gigabit ports started intermittently disconnecting, and now they are not working at all, although the connection indicator is present. The 100-megabit ports are functioning, and it's possible to connect to the router using Winbox through the 100-megabit port. The issue remains unresolved
Firmware type: ar9334
Factory Firmware: 6.42.12
Current Firmware: 7.12.1
Upgrade Firmware: 7.12.1