The 1st error suggests that the machine had already lost its valid IP lease by 9:09am when the time sync was attempted.
The 2nd error is by itself harmless. It's a normal part of (NetBIOS) browser operation, except in this case it may also be a side-effect of the machine losing/gaining network connectivity.
The 3rd one is an obvious problem.
By default, DHCP clients will attempt to renew their leases (for the first time) at 50% of the lease duration interval, so the fact that this appears to happen to you every morning suggests to me that the lease interval configured on the DHCP server (the router?) is uncharacteristically short. IPCONFIG /ALL would tell you precise details of that interval. If it's anything shorter than a week, you may possibly gain some respite by increasing the lease duration to say 2 weeks, or even longer.
Otherwise, the most obvious explanation for these symptoms would a problem with the NIC drivers
on the 3 XP machines - especially if they all share the same NIC model and the same driver
. Something happens to them internally at DHCP lease renegotiation time and there is no obvious link to the hardware since other OSs and devices don't have DHCP problems using the same infrasturcture.
I'd suggest briefly testing a completely different model of NIC on one of the XP machines.