Invalid URI in request - Url tronquée

Bonjour,
Je ne vois pas d'où peut venir ces erreurs :

Code:

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[Thu Sep 23 15:23:17 2010] [error] [client 87.65.231.135] Invalid URI in request etNotifications.php HTTP/1.1
[Thu Sep 23 15:23:17 2010] [error] [client 87.65.231.135] Invalid URI in request otifs.php HTTP/1.1
[Thu Sep 23 15:33:46 2010] [error] [client 10.101.100.1] Invalid URI in request otifs.php HTTP/1.1
[Thu Sep 23 16:57:37 2010] [error] [client 10.8.0.28] Invalid URI in request Notifications.php HTTP/1.1
[Thu Sep 23 17:29:06 2010] [error] [client 10.8.0.1] Invalid URI in request Notifications.php HTTP/1.1
[Thu Sep 23 17:31:02 2010] [error] [client 91.179.135.177] Invalid URI in request etNotifications.php HTTP/1.1
[Thu Sep 23 17:31:02 2010] [error] [client 91.179.135.177] Invalid URI in request otifs.php HTTP/1.1
[Thu Sep 23 17:33:09 2010] [error] [client 10.120.100.1] Invalid URI in request otifs.php HTTP/1.1
[Thu Sep 23 17:37:41 2010] [error] [client 91.180.167.239] Invalid URI in request fications.php HTTP/1.1
[Thu Sep 23 17:37:41 2010] [error] [client 91.180.167.239] Invalid URI in request pdateNotifs.php HTTP/1.1
[Thu Sep 23 17:42:47 2010] [error] [client 91.179.135.177] Invalid URI in request etNotifications.php HTTP/1.1
[Thu Sep 23 17:42:48 2010] [error] [client 91.179.135.177] Invalid URI in request otifs.php HTTP/1.1
[Thu Sep 23 17:43:24 2010] [error] [client 10.120.100.1] Invalid URI in request otifs.php HTTP/1.1

Le début de l'url est tronqué aléatoirement pour certains utilisateurs,
Alors le log apache grandit...

Serait-ce des navigateurs fous ?