Virtual server looses network connectivity when moved to different esxi on different switch

We had vendor implement our 4th esxi server.  We orginally had 2 esxi severs and connected to our cisco catalyst 3750g switch.  When we implemented the 3rd & 4th esxi server they had to connect to cisco catalyst 3750-x switch.  If i do the following vmotion this is what happens:

from esx1 to esx2 or vice versa - it's fine

from esx1 or esx2 to esx3 or esx4 - the server looses connectivity.  sometimes in the past if we switched the network card back and forth it would fix it but it doesn't anymore

from esx3 or esx4 back to esx1 or esx2 - the server gains back it's connectivity.  

I had vmware look at our settings and they said it looks good.  I'm thinking it's a switch issue but not as famiilar with switches.  Any help would be appreciated.  i
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It would seem there is a physical networking, configuration issues.

are you using VLANs, and Trunks ?

are the physical connections to the vSwitches the same as ESX1 and ESX2 ?

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GCBITAuthor Commented:
when you say vSwitches to you mean our qlogic fibre switch? we also have 2 fibre switches for redundancy and all 4 are plugged into each fibre switch.  

But 1 & 2 or plugged into 1 cisco networking switch and 3 & 4 are plugged into another cisco networking switch.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It would seem like you have a network configuration issues on the

3 & 4 are plugged into another cisco networking switch.

why are they not plugged into the same switches as 1 & 2 ?
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GCBITAuthor Commented:
ran out of ports . . .
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
As a test, could you swap?
Bryant SchaperCommented:
could the networks be named different on the ESX 3 and 4, so vmotion does not know which network to associate the vm with?  Want to say the migration throws an error in this case.  But it sounds like networking and host configuration.
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