-Do they work in NI MAX separately fine or they give same error?
-Is this always occurs after same time and for same cameras(How many are you using?)?
-Did you try changing the cables and ports and PC and still same issue?
-What camera make and models you are using?
-If USB: Try unchecking the option "Allow the Computer to turn off this device to save power" under USB Connections in Device manager.
-Some additional info: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P8jKSAS&l=en-IN
-What is the resolution you are trying to capture at and which version of labview are you using?
Thanks
uday
