Keynote video signal drops out

Keynote 4 video signal drops out during presentations where we are switching between two different Apple Computers (one G4 and one Intel). Both machines had previous versions of Keynote on them and over a period of time never had a signal drop out condition. Sounds like new version problem.
Any input appreciated.

I have two laptops each with their video out adapter connected and then cabled to a switch box where the big monitors project the signal of the laptop that the swtich box is set to. Like channel selection. Previous versions of Keynote were never a problem and I mean never. The signal came right through but now with Keynote 4 the signal drops out even tho the laptop is still active and apparently sending a signal through its video out connection. I have to hit escape and get out of keynote and then go back to PLAY for keynote to once again send that signal.

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We have 7 Apple TV's throughout our company and all of them exhibit the same behaviour, on many different laptops.
All laptops are running minimum of OS 10.9.2.
We have a Cisco Clean Air WiFi network with excellent signal coverage in all areas surrounding each of the AirPlay devices.
Here's exactly what happens:
User will enter conference room with Apple TV connected to an LED Flat Panel TV. Power it up, then select the appropriate Airplay device from their Airplay menu and begin streaming mirroring their desktop to the television set. Within 2 minutes, the signal drops, forcing the user to re-select the airplay device once again. Usually it will drop again within 2 minutes.
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I have two laptops each with their video out adapter connected and then cabled to a switch box where the big monitors project the signal of the laptop that the swtich box is set to. Like channel selection. Previous versions of Keynote were never a problem and I mean never. The signal came right through but now with Keynote 4 the signal drops out even tho the laptop is still active and apparently sending a signal through its video out connection. I have to hit escape and get out of keynote and then go back to PLAY for keynote to once again send that signal.

Video & Audio Drop Outs on Macbook Pro

I have a MacBook Pro with Version 10.7.3, 6 months old. Just recently when I play video, regardless of whether it's in iTunes, iMovie, or embedded in Keynote the video sticks, audio drops out for 1 -2 seconds or the shot freezes. What causes this and how is it fixed.

I apologize for the audio drop outs. I have sent you a private message to get account information from you so we can reprogram your boxes.
Anthony_VZ
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After no problem for 2 yrs, signal dropping out intermittently.

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Is this sort of problem common when an Airport Express is going bad? The AE has not been relocated.
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We've had our AE "quit" randomly for a couple of years. I thought ot was Comcast & would reset the modem. I've found that the unit is warm to the touch. What I now do is to unplug the AE for a couple of minutes. This seems to do the trick. I guess I'm resetting it without messing with passwords, etc.

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It occured to me that maybe there is disc fragmentation, however the hard drive is 1.36 TB free on the 2 TB disc, so I think that it would be unlikely to be fragmented.
I wonder if anyone has any suggestions?
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ayam,
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All,
Well, the problem is finally fixed and I just enjoyed a lengthy video chat with my folks back in Europe without any interruptions.
After some detective work I got in touch with the NOC of the Internet exchange in Amsterdam, the hop where the packets were starting to get dropped. They were very helpful and eventually determined a defective router blade as the root cause of the problem. The defective router blade in Amsterdam got swapped out and now we are back in business!
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While I'm glad the issue got finally resolved, I am a little bit disappointed with the involvement of the ISPs (the DSL providers) on both ends. The Tech Support of the ISP in Europe was very helpul (in providing a traceroute from their end), but eventually their support person did not know how to properly escalate a problem like this within their organisation. -- I don't think it is ok to expect end users to perform the amount of research we have done on this.
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Keynote video signal drops out

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