I've got a new 24" Dell monitor hooked up to my new RMBP over Thunderbolt and I'm noticing about 3/4 times my Mac goes to sleep and I come back the external display will not wake up. It just sits there saying there is no connection even though the Mac wakes up just fine. Most of the time it stays this way but just a moment ago it kicked on by itself after about 4 minutes of me using the laptop. Of course if I unplug/plug back in it kicks back on fine but I shouldn't have to be doing that. Is anyone else noticing this at all?