hi i have this same problem
Boot Mode: Normal
Model: MacBookPro8,1
System diagnostics
2015-01-07 WindowServer crash
2015-03-19 WindowServer crash
2015-03-20 WindowServer crash
2015-03-20 WindowServer crash
User diagnostics
2015-03-19 com.apple.WebKit.Plugin.64 crash
2015-03-24 com.apple.WebKit.Plugin.64 crash
2015-04-14 com.apple.WebKit.Plugin.64 crash
2015-04-14 com.apple.WebKit.Plugin.64 crash
Kernel messages
Apr 13 23:40:42 wl0: Roamed or switched channel, reason #8, bssid 32:91:8f:69:b5:0d
Apr 14 01:00:48 Over-release of kernel-internal importance assertions for pid 17 (syslogd), dropping 1 assertion(s) but task only has 1 remaining (1 external).
Apr 14 01:01:09 wl0: Roamed or switched channel, reason #8, bssid 32:91:8f:69:b5:0d
Apr 14 02:27:47 wl0: Roamed or switched channel, reason #2, bssid 32:91:8f:69:b5:0d
Apr 14 02:40:26 BUG in process suhelperd[160]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
--- last message repeated 7 times ---
Apr 14 03:10:01 wl0: Roamed or switched channel, reason #2, bssid 32:91:8f:69:b5:0d
--- last message repeated 3 times ---
Apr 14 05:38:22 process com.apple.WebKit[1156] thread 141795 caught burning CPU!; EXC_RESOURCE supressed due to audio playback
Apr 14 08:40:27 BUG in process suhelperd[160]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
--- last message repeated 157 times ---
Apr 14 09:12:14 BUG in process suhelperd[158]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
--- last message repeated 130 times ---
Apr 14 09:12:32 wl0: Roamed or switched channel, reason #8, bssid 32:91:8f:69:b5:0d
Apr 14 09:12:53 BUG in process suhelperd[158]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
Apr 14 09:56:00 wl0: Roamed or switched channel, reason #2, bssid 32:91:8f:69:b5:0d
--- last message repeated 2 times ---
Apr 14 13:30:49 BUG in process suhelperd[181]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
--- last message repeated 130 times ---
Apr 14 13:31:08 wl0: Roamed or switched channel, reason #8, bssid 32:91:8f:69:b5:0d
Apr 14 13:31:15 BUG in process suhelperd[181]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
Apr 14 16:01:12 wl0: Roamed or switched channel, reason #4, bssid 32:91:8f:69:b5:0d
Apr 14 16:01:37 wl0: Roamed or switched channel, reason #8, bssid 32:91:8f:69:b5:0d
Apr 14 16:43:10 wl0: Roamed or switched channel, reason #2, bssid 32:91:8f:69:b5:0d
--- last message repeated 5 times ---
Extrinsic daemons
com.microsoft.office.licensing.helper
com.adobe.fpsaud
com.seagate.TBDecorator.plist
Extrinsic agents
com.bittorrent.uTorrent
com.divx.agent.postinstall
com.sierrawireless.SwitchTool
com.google.keystone.user.agent
launchd items
/Library/LaunchAgents/com.sierrawireless.SwitchTool.plist
(com.sierrawireless.SwitchTool)
/Library/LaunchDaemons/com.adobe.fpsaud.plist
(com.adobe.fpsaud)
/Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist
(com.microsoft.office.licensing.helper)
Library/LaunchAgents/com.bittorrent.uTorrent.plist
(com.bittorrent.uTorrent)
Library/LaunchAgents/com.divx.agent.postinstall.plist
(com.divx.agent.postinstall)
Library/LaunchAgents/com.google.keystone.agent.plist
(com.google.keystone.user.agent)
Extrinsic loadable bundles
/System/Library/Extensions/cdc_ecm_qmi_LTE.kext
(com.zte.LTEdriver.cdc_ecm_qmi)
/System/Library/Extensions/cdc_LTE.kext
(com.zte.LTEdriver.cdc_usb_bus)
/System/Library/Extensions/EPSONUSBPrintClass.kext
(com.epson.print.kext.USBPrintClass)
/System/Library/Extensions/hp_Deskjet_io_enabler.kext
(com.hp.print.hpio.Deskjet.kext)
/System/Library/Extensions/hp_fax_io.kext
(com.hp.kext.hp-fax-io)
/System/Library/Extensions/hp_Inkjet1_io_enabler.kext
(com.hp.print.hpio.Inkjet1.kext)
/System/Library/Extensions/hp_Inkjet2_io_enabler.kext
(com.hp.print.hpio.Inkjet2.kext)
/System/Library/Extensions/hp_Inkjet3_io_enabler.kext
(com.hp.print.hpio.Inkjet3.kext)
/System/Library/Extensions/hp_Inkjet4_io_enabler.kext
(com.hp.print.hpio.Inkjet4.kext)
/System/Library/Extensions/hp_Inkjet5_io_enabler.kext
(com.hp.print.hpio.Inkjet5.kext)
/System/Library/Extensions/hp_Inkjet7_io_enabler.kext
(com.hp.print.hpio.inkjet7.kext)
/System/Library/Extensions/hp_Inkjet8_io_enabler.kext
(com.hp.print.hpio.inkjet8.kext)
/System/Library/Extensions/hp_Inkjet9_io_enabler.kext
(com.hp.print.hpio.Inkjet9.kext)
/System/Library/Extensions/hp_Inkjet_io_enabler.kext
(com.hp.print.hpio.Inkjet.kext)
/System/Library/Extensions/hp_Laserjet_io_enabler.kext
(com.hp.print.hpio.Laserjet.kext)
/System/Library/Extensions/hp_Officejet_io_enabler.kext
(com.hp.print.hpio.Officejet.kext)
/System/Library/Extensions/hp_Photosmart_io_enabler.kext
(com.hp.print.hpio.Photosmart.kext)
/System/Library/Extensions/hp_PhotosmartPro_io_enabler.kext
(com.hp.print.hpio.PhotosmartPro.kext)
/System/Library/Extensions/hp_psa640_io_enabler.kext
(com.hp.hpio.hp_psa640_io_enabler)
/System/Library/Extensions/hp_qc_io_enabler.kext
(com.hp.hpio.hp_psa530_630_io_enabler)
/System/Library/Extensions/HuaweiDataCardDriver.kext
(com.huawei.driver.HuaweiDataCardDriver)
/System/Library/Extensions/JMicronATA.kext
(com.jmicron.JMicronATA)
/System/Library/Extensions/Seagate Storage Driver.kext
(com.seagate.driver.PowSecDriverCore)
/System/Library/Extensions/SierraDIPSupport.kext
(com.sierrawireless.driver.SierraDIPSupport)
/System/Library/Extensions/SierraFSRSupport.kext
(com.sierrawireless.driver.SierraFSRSupport)
/System/Library/Extensions/SierraHSRSupport.kext
(com.sierrawireless.driver.SierraHSRSupport)
/System/Library/Extensions/SierraIPDirect.kext
(com.sierrawireless.driver.SierraIPDirect)
/System/Library/Extensions/USBExpressCardCantWake_Huawei.kext
(com.apple.dts.driver.USBExpressCardCantWake)
/System/Library/Extensions/ZTELTEUSBCDCACMData.kext
(com.ZTE.driver.ZTELTEUSBCDCACMData)
/System/Library/Extensions/ZTELTEUSBMassStorageFilter.kext
(com.ZTE.driver.ZTELTEUSBMassStorageFilter)
/System/Library/Extensions/ZTEUSBCDCACMData.kext
(com.ZTE.driver.ZTEUSBCDCACMData)
/System/Library/Extensions/ZTEUSBMassStorageFilter.kext
(com.ZTE.driver.ZTEUSBMassStorageFilter)
/Library/Internet Plug-Ins/DivXBrowserPlugin.plugin
(com.divx.DivXBrowserPlugin)
/Library/Internet Plug-Ins/Flash Player.plugin
(com.macromedia.Flash Player.plugin)
/Library/Internet Plug-Ins/iPhotoPhotocast.plugin
(com.apple.plugin.iPhotoPhotocast)
/Library/Internet Plug-Ins/OVSHelper.plugin
(com.divx.OVSHelper)
/Library/Internet Plug-Ins/SharePointBrowserPlugin.plugin
(com.microsoft.sharepoint.browserplugin)
/Library/Internet Plug-Ins/SharePointWebKitPlugin.webplugin
(com.microsoft.sharepoint.webkitplugin)
/Library/PreferencePanes/DivX.prefPane
(com.divx.divxprefs)
/Library/PreferencePanes/Flash Player.prefPane
(com.adobe.flashplayerpreferences)
/Library/PreferencePanes/NTFSforMacOSX.prefPane
(com.paragon-software.filesystems.ntfs.prefpanel)
Library/Address Book Plug-Ins/SkypeABDialer.bundle
(com.skype.skypeabdialer)
Library/Address Book Plug-Ins/SkypeABSMS.bundle
(com.skype.skypeabsms)
Library/iTunes/iTunes Plug-ins/TuneUp/TuneUp Visualizer.bundle
(com.tuneupmedia.iTuneUpVisualizer)
Extrinsic shared libraries
/usr/lib/libgutenprint.2.0.3.dylib
/usr/lib/libUFSDNTFS.dylib
User login items
Garmin Express Service
iTunesHelper
Mobile Broadband Manager
Safari extensions
searchExt
Restricted user files: 232
Font problems: 4
Bad plists
Library/Preferences/com.apple.WebFoundation.plist
Elapsed time (s): 159