sessions files on server

Hello, in my server there is a folder named session (C:\ScreenConnect\App_Data\Session) in which there are more than 20000 files, and the total space occupied is more than 200GB. Is it possible to delete the older ones? Moreover, the DB of the application is almost 2 GB, and in the last days I'm facing a strange problem: all the clients get disconnected at the same time and I have to reboot the server. Is this problem due to the DB size, or the excessive number of files in the Session folder, or anything else?