Network Problem (Unidentified Network)

Hi all,
This is Ravi working as a hardware technician in a college and iam new to this forum.

Coming to my problem, we have a network issue in our computer labs.
Description: Ground floor-Lab-1 & Lab-2
First floor-Lab-3 & Lab-4 & Server Room.
Second floor-Lab-5 & Lab-6
all systems are connected to patchpanel and then to switch, all switches and patchpanels are connected to core switch(dlink 100Mbps). uplinks to Lab1 & 2, Lab5 & 6 from server room. for lab 5 & 6 we are using manageble 1Gbps switches all labs configured with manual ips.this is my labs structure.
some times iam getting unidentified network in all systems.if i remove lab5&6 uplink then it is ok with other i need to remove once and reconnect uplink then ok. why it is persisting ...,

its a great help to me to give solution any one.
Thanking you all

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Clarification Request
That size network should have

You should have an IT staff or outsource when there is trouble. How did it grow to this size without the usual staff or services?

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we are the it staff

Thanks for the reply sir, here we are the IT staff. no outsource people will come sir..,

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