(nouveau) Macbookair gelant des minutes, environ 5 fois par jour, peut être déplacé avec la souris - quelle pourrait être la source du problème?

Ci-dessous la sortie de la console. J'ai fait le début et la fin du gel en gras. Avez-vous une idée de ce que pourrait être la source?

06.09.13 19:30:49,000 kernel[0]: sav: [EWOULDBLOCK][vnode:0xffffff801d9fbd90][original:0xffffff801d9fbd90][callback: 0 count:267 ] onaccessctl_check:1717 result:0 disconnected:0    
06.09.13 19:30:49,000 kernel[0]: sav: current scan list:   
06.09.13 19:30:49,000 kernel[0]: sav: (pid 17159 [mtmd], vnode 0xffffff801d9fbd90 [/Users/theair/Library/Application Support/Google/Chrome/Default/Session Storage/000263.log], [context 0xffffff801983c690] [result 0] [setup 0] [disconnected 0] [vfsbusy 0]) - 1 waiter(s)    
06.09.13 19:30:49,000 kernel[0]: sav: available kctl entries: 9    
06.09.13 19:30:49,000 kernel[0]: sav: onaccess_send: NULL target or context; request:0 kctl_entry:0xffffff801c79d000    
06.09.13 19:30:49,000 kernel[0]: sav: onaccess_send: not SAV_KCTL_REQ_COMPLETE, return ENOMEM    
06.09.13 19:30:49,000 kernel[0]: sav: onaccess_send: NULL target or context; request:3 kctl_entry:0xffffff801c79d000    
06.09.13 19:30:49,000 kernel[0]: sav: onaccess_send: SAV_KCTL_REQ_COMPLETE, intercheck_done()    
**06.09.13 19:30:50,334 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationBirth to notificationID=116**    
06.09.13 19:30:50,334 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationBirth to notificationID=143    
06.09.13 19:30:50,334 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationBirth to notificationID=1346    
06.09.13 19:30:50,362 com.apple.mtmd[17159]: stat on /Users/theair/Library/Application Support/Google/Chrome/Default/History Index 2013-09-journal: No such file or directory   
06.09.13 19:30:50,000 kernel[0]: nspace-handler-unblock: did not find token 301236    
06.09.13 19:30:50,912 WindowServer[82]: reenable_update_for_connection: UI updates were finally reenabled by application "Microsoft Outlook" after 596.34 seconds (server forcibly re-enabled them after 1.00 seconds)    
06.09.13 19:30:51,481 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=100    
06.09.13 19:30:51,523 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=100    
06.09.13 19:30:51,548 coreservicesd[31]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationReady to notificationID=9717
06.09.13 19:30:54,347 mdworker[80656]: ENSpotlightImporter:managedObjectModel unable to load model at URL file://localhost/.MobileBackups/Computer/2013-09-06-192050/Volume/Users/theair/Library/Containers/com.evernote.Evernote/Data/Library/CoreData/com.evernote.Evernote/.support/model.mom  

06.09.13 19: 30: 54,348 mdworker [80656]: ENSpotlightImporter: importFileAtPath: attributs: erreur: exception interceptée: impossible de créer un NSPersistentStoreCoordinator avec un modèle nil

06.09.13 19:32:27,316 coreaudiod[172]: Disabled automatic stack shots because audio IO is active    
06.09.13 19:32:27,491 coreaudiod[172]: Enabled automatic stack shots because audio IO is inactive    
06.09.13 19:33:12,332 Dock[183]: no information back from LS about running process

Selon le commentaire @cluesque , voici le fil conducteur suggérant que Sophos est à blâmer . Les éléments communs incluent la paire nspace-handler-set-snapshot-timeet nspace-handler-unblock, séparés par environ 10 minutes d'inactivité de la machine.

^{Connexes: beachball constant et se bloque sans utilisation intensive du processeur, message «nspace-handler-update: n'a pas trouvé de jeton»} .