Hi , As stated in the title I have a problem with the bridge of the CRS, I'll explain, if I create a bridge, where I put some in about 18 ports on the router, everything works, but the ip address that I assign to the bridge that use for maintenance 192.168.8.x / 24 after about a minute does not work anymore and I can not access even with the mac address, no I have two of these CRS and thinking it was a defective one I did the test with the other, but nothing same result, I have updated to the latest version 6.18 but nothing the same.
For if the CRS has a problem with the bridge mode?

Are you sure that you want to bridge 18 ports? Using the switch chip would use a lot less CPU.

As regards the bridge/IP issue - can you upload the config?