[AT&T Samsung Galaxy S II Skyrocket SGH-I727] econan1214:
I don't know why my phone sometimes vibrates itself 3 times as if an app is getting forced close.

Here is the logcat :

--------- beginning of /dev/log/main

I/Choreographer(27928): Skipped 123 frames! The application may be doing too much work on its main thread.

I/System.out(27928): tainted command part 0: logcat

I/System.out(27928): tainted command part 1: -v

I/System.out(27928): tainted command part 2: brief

I/System.out(27928): tainted command part 3: *:V

D/dalvikvm(27928): GC_CONCURRENT freed 1793K, 26% free 10314K/13767K, paused 16ms+2ms, total 125ms

D/InputTransport(27928): Input channel constructed: name='41baa100 Toast (client)', fd=61

D/dalvikvm(27928): GC_CONCURRENT freed 400K, 25% free 10379K/13767K, paused 13ms+3ms, total 50ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 17ms

D/dalvikvm(27928): GC_FOR_ALLOC freed 5K, 22% free 10813K/13767K, paused 30ms, total 30ms

D/dalvikvm(27928): GC_CONCURRENT freed <1K, 19% free 11253K/13767K, paused 15ms+13ms, total 53ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 31ms

D/dalvikvm(27928): GC_CONCURRENT freed <1K, 16% free 11665K/13767K, paused 3ms+2ms, total 28ms

D/InputTransport(27928): Input channel destroyed: name='41baa100 Toast (client)', fd=61

D/dalvikvm(27928): GC_CONCURRENT freed 1368K, 22% free 10748K/13767K, paused 15ms+9ms, total 70ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 53ms

D/dalvikvm(27928): GC_CONCURRENT freed 11K, 19% free 11221K/13767K, paused 8ms+7ms, total 40ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 32ms

D/dalvikvm(27928): GC_CONCURRENT freed 2K, 16% free 11664K/13767K, paused 2ms+2ms, total 50ms

D/dalvikvm(27928): GC_CONCURRENT freed 561K, 16% free 11591K/13767K, paused 2ms+2ms, total 34ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 22ms

D/dalvikvm(27928): GC_CONCURRENT freed 395K, 16% free 11669K/13767K, paused 13ms+5ms, total 50ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 32ms

D/dalvikvm(27928): GC_CONCURRENT freed 366K, 15% free 11742K/13767K, paused 13ms+9ms, total 74ms

D/dalvikvm(27928): GC_CONCURRENT freed 437K, 15% free 11750K/13767K, paused 12ms+14ms, total 57ms

D/dalvikvm(27928): GC_CONCURRENT freed 461K, 15% free 11743K/13767K, paused 12ms+2ms, total 39ms

D/AbsListView(27928): Get MotionRecognitionManager

D/InputTransport(27928): Input channel constructed: name='42097fb8 AtchDlg:org.jtb.alogcat/org.jtb.alogcat.LogActivity (client)', fd=61

D/dalvikvm(27928): GC_CONCURRENT freed 404K, 14% free 11897K/13767K, paused 13ms+21ms, total 88ms

I/PrivacyContext(27928): now we are in execStartActivity() from package: org.jtb.alogcat

D/InputTransport(27928): Input channel destroyed: name='42097fb8 AtchDlg:org.jtb.alogcat/org.jtb.alogcat.LogActivity (client)', fd=61

D/dalvikvm(27928): GC_CONCURRENT freed 1923K, 24% free 10524K/13767K, paused 12ms+4ms, total 79ms

D/AbsListView(27928): Get MotionRecognitionManager

D/dalvikvm(27928): GC_CONCURRENT freed 480K, 24% free 10541K/13767K, paused 12ms+14ms, total 91ms

D/InputTransport(27928): Input channel constructed: name='41ee4910 android/com.android.internal.app.ChooserActivity (client)', fd=61

D/libEGL (27928): loaded /system/lib/egl/libEGL_adreno200.so

D/libEGL (27928): loaded /system/lib/egl/libGLESv1_CM_adreno200.so

D/libEGL (27928): loaded /system/lib/egl/libGLESv2_adreno200.so

I/Adreno200-EGLSUB(27928): <ConfigWindowMatch:2087>: Format RGBA_8888.

E/ (27928): <s3dReadConfigFile:75>: Can't open file for reading

E/ (27928): <s3dReadConfigFile:75>: Can't open file for reading

D/OpenGLRenderer(27928): Enabling debug mode 0

D/dalvikvm(27928): GC_CONCURRENT freed 315K, 23% free 10718K/13767K, paused 12ms+23ms, total 92ms

D/dalvikvm(27928): GC_CONCURRENT freed 388K, 22% free 10842K/13767K, paused 14ms+12ms, total 81ms

D/dalvikvm(27928): WAIT_FOR_CONCURRENT_GC blocked 11ms

I/Choreographer(27928): Skipped 30 frames! The application may be doing too much work on its main thread.

I/Adreno200-EGLSUB(27928): <ConfigWindowMatch:2087>: Format RGBA_8888.

I/Adreno200-EGLSUB(27928): <ConfigWindowMatch:2087>: Format RGBA_8888.

D/dalvikvm(27928): GC_CONCURRENT freed 316K, 21% free 10925K/13767K, paused 7ms+15ms, total 56ms

I/PrivacyContext(27928): now we are in execStartActivity() from package: android

D/InputTransport(27928): Input channel destroyed: name='41ee4910 android/com.android.internal.app.ChooserActivity (client)', fd=61

I/System.out(27928): tainted command part 0: logcat

I/System.out(27928): tainted command part 1: -v

I/System.out(27928): tainted command part 2: brief

I/System.out(27928): tainted command part 3: *:V

D/InputTransport(27928): Input channel constructed: name='41d164e0 Toast (client)', fd=67

D/dalvikvm(27928): GC_CONCURRENT freed 498K, 21% free 10904K/13767K, paused 4ms+15ms, total 100ms

D/InputTransport(27928): Input channel destroyed: name='41d164e0 Toast (client)', fd=67