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Check down the IP of the Windows Boot Manager perhaps?
I would expect that someone is running a Windows / Microsoft PXE rep (in parallel to yours) that's effectively running/causing race-conditions as to which PXE rep is serving a client first?
That's not a good thing .
But should be "just" a matter of educating that person to not be serving your corporate network (surprising how often I see dev-setups "hop over" to be connected to a corporate network ... a lot of "fun" with "rogue" DHCP servers too as one can imagine).
That'd be my first guess. That's not something "we" do .