T420 acts weird when in docking station

Hi.
I'm useally very happy for my T420, but lately it is annoying me, when I put it in Docking station.
When I dock it and power on, it acts if either I keep clicking the left mouse button all the time or as if I'm holding down the CTRL key.
I fix it by restarting the machine 1-2 up to 3 times in the morning. And then It useally behave the rest of the day. Untill next day.
I have tried to change keyboard and mouse, same problem.
I have tried to clean the notebook keyboard, no effect.
I have tried to keep the notebook lid open, but as I'm working on to external screens that is not a lasting solutions.
It is acting normal when not in docking.
Does anyone have suggestions to what I could try? It is driving me mad as it only appears sporedicly in the mornings (at first docking of the day)
Br, Mew

If the problem only happens when the laptop lid is closed then you need to make sure the antenna wires are laying flat in their slots. If they are sticking up at all their causing a crease into the keyboard ribbon cable.
See here:
http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T420s-keyboard-issues-Same-issue-as-T410-ke...
and Here:
http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T420-minidock-series-3-gt-external-keyboard...

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