Problem with AS/400 Devices

Has anyone experienced this?

1.)  There is a 3486 Dumb Terminal that fails, cursor is on the upper left
of the screen and the status of these devices on the AS/400 is "failed" .
Do we have to change the emulation type that these terminals are emulating.

2.)   There is this Dumb Terminal that return to sign on screen even though
they are using these devices. And there are dumb terminals that return to
sign on screen even though this terminals are idle, terminal screen are on
users menu.

     Note: This is a terminal that had dual session and only one session
     return to sign on screen.

3.   Once users are using this device, there are times that the character
they are encoding/typing is not displayed. But when they check it, number 0
sometimes replaces the character.






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