Hi everyone!
Recently i bought CSS326-24G-2S+ and of course update that on the latest version SwOS (2.7). I configured only identity and ip address and connected all users into the switch. All 24G ports were used. On monday, near half of working day, switch was stopping forwarding and didn't reply on the web-interface and ping. But all ports were active. After reboot it was working normally, but today it were happing again.

I am running into this problem also. What other network devices are you using?
The switch is connected to Unifi 16xg using a 10G fiber module(port SFP1) , the unifi switch is then connected RB3011 that is the DHCP server.
I am going to roll back to 2.6 and see if that makes a difference.