Win 7 PC freeze and block network access for other PC on same switch during windows update from WSUS

Hello,
It's been a problem for me for a long time now, but the last time (today) I found 3 PC on 2 different switches that block all the network on this 2 switches during the update. 
I have a Domain with 80 PC with Win 7 (32&64bit) that takes the updates from the WSUS server that is configured on a Win2k8 r2. The system works well from 2 years from now but sometimes cause this errors that make me look like a dummy in front of angry
employees. If one of the PC get freeze , it will cause lost of connection on all the PC on same switch, and i have to find the blocked PC, remove from network, restart switch and hope that they will came back on.
Does anyone experienced this problem? Any help will be appreciated 
Thank you!
List of updates for today below

Hi
Thanks for your response, yes I understand that the result is a Broadcast Storm and yes I have the cheapest switch on market :/.
The interest fact is that on one PC, I changed everything and keep only the old HDD and on last updates yesterday it was one of the blocked one too. So this make
me doubt that is something wrong in software on that PC. I don't have any third-part programs except browsers and all have Genuine Win7 
The only investigation remained is what happens during the update process? 
Is WSUS involved in something?
And another thing is the fact that some of the PC are cloned, but I have carefully changed the SID
Thank you for your support

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