Thunderbolt screen not reacting with Yosemite

I updated this week to Yosemite on my MacBook Pro 2012, connected to a Thunderbolt screen.
All working fine, but as soon as my MacBook goes in sleeping mode, the thunderbolt screen will not react anymore.
MacBook awakes, starts up again, thunderbolt screen stays black.
Only thing that helps is turning electricity off of the screen, put it on again and everything comes to life again.
Didn't have this problem with Mountain Lion or Mavericks.

Im also having an issue with my monitor since I updated to Yosemite.  I have a mid 2010 15" mac book pro.
Everything seems to be working fine until i plug in my old apple monitor thru a mini video adaptor.  Then
my computer slows and freezes, its unusable.  I spent a few hours at the genious bar with my mac book pro
yesterday, tested fine, working fine without the monitor plugged in.  Never had an issue with Mavericks or any
other OS.

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