Logon really slow for XP computers but fine with Windows 7

Hi,
We have 2 domain controllers (both running 2008 R2) and a few hundred computers on our domain.
Since the past 3 weeks, we've been experiencing really slow logins for computers with Windows XP (doesn't seem to affect the computers with win7). It happens once a week in the morning. If we reboot both DCs, problem goes away.
I've checked the logs and i don't see anything wrong. As far as i know, nothing special was done lately.
Since i can't reproduce the problem and the logs are clean, it's really hard to put the finger on the culprit.
I'd really appreciate some ideas or past experiences.
Thank you

Hi
If it happen after the user enter the credential, I would activate the gpsvc.log to monitor the winlogon. That log will show, with a timestamp, what is applied when the user login. Really usefull to find bloat GPO that take too much time to execute or such.
Click Start, click Run, type regedit, and then click
OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion
On the Edit menu, point to New, and then click
Key.
Type Diagnostics, and then press ENTER.
Right-click the Diagnostics subkey, point to New, and then click
DWORD Value.
Type GPSvcDebugLevel, and then press ENTER.
Right-click GPSvcDebugLevel, and then click Modify.
In the Value data box, type 0x30002, and then click
OK.
Exit Registry Editor.
At a command prompt, type the following command, and then press ENTER:
gpupdate /force
View the Gpsvc.log file in the following folder:
%windir%\debug\usermode
Regards, Philippe
Do i activate it on the DC or the client computers?
Thank you

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