1200LE – mouse click beeps – keys work

1200LE fw 5.2.069
ini file:
Autoload=1
Signon=0
Resolution=1024×768
DeskColor=”000 000 000″
TimeServer=10.30.1.200
Privilege=None Lockdown=No

#RDP Client Preferences (note: needs line continuation character )
Connect=rdp
host=10.30.2.20
domainname=xyzcorp
fullscreen=yes
autoconnect=1

works fine – well it did.
now at random times – different users, different servers i get a condition where the user states ‘I’m locked up’.
examining – i find the mouse clicks do not function – they just send a beep. remote console to the user session does the same – i can hear their machine beep when i click the mouse.
keyboard works fine. solution is to keyboard log off (start button on keyboard log off save work etc).
when the user immediately restarts the 1200le they can log in and function as normal.

we have tried just unplugging the mouse and swapping – no good.
power off poweron – no good most of the time- sometimes the user can work – but for minutes then condition comes back.
the true solution is to end the session.

thoughts?
thanks
dan