I have an RB493G and lately a strange problem started to appear. This issue appeared twice already: 2-4 ports completely stop to pass traffic while the links remain up. And there is nothing about this in logs. Just zero traffic in interfaces. But port 1, 7, 8 and WLAN remain working. Reboot fixes this problem. According to block diagram of RB493G, ports 2-5 belong to one switch chip and it looks like a chip failure.
Is there anything I can do about it without chip replacement?