ICX7150 – no available SSH session

Good evening to all, I would have a problem on a Ruckus ICX7150-48P-4X10GR switch installed in the company where I work, in some cases it involves connecting to ssh.Initially we had no problem connecting to ssh, for about two weeks it has happened that trying to connect in ssh we have this error (I add stamp).Receiving this error is as if there were no more sessions available for the ssh connection, connecting to the console giving the “sh who” command we actually see that the ssh sessions are almost all closed and therefore available.The solution to this problem is to wait a few minutes (usually 10-15) to be able to connect again.Has anyone like this happened to anyone?The version mounted on the switch isSW: Version 08.0.80dT211Thank you in advance