reconnect and ssh again inside one terminal session [1]

I proud to use this product, it's amazingly helpful! Anyway, some how I got difficulties. When I try to connect to server A, and then ssh to server B from server A terminal, some policies from server A will disconnect every 1 hour. Is there any possibilities from xshell to know if the terminal on ServerA logoff from ServerB and then send a key to ssh Server B again?

topology:
PC ---> ServerA (inside serverA terminal, not create a new session) ---> ServerB

Thank you very much

Program Ver. : Xshell 4

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