Yes, all 4 SD Cards now working. All 4 have errors in the other PI.

NEW Pi - No Problems.

No overclocking. wheezy.

[ 4802.340017] EXT4-fs warning (device mmcblk0p2): ext4_end_bio:251: I/O error writing to inode 1233 (offset 2621440 size 524288 starting block 316160) [ 4802.564648] mmc0: final write to SD card still running [ 4812.592093] mmc0: Timeout waiting for hardware interrupt - cmd12. [ 4812.592301] mmcbl...

The problem ist still without any device connected.

If it freezes there is no change to type in demsg, but here is the "normal" output: [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.2.27+ (dc4@dc4-arm-01) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #160 PREEMPT Mon Sep ...

My PI freezes in a randome time.
I've testes several SD Cards, another DC Power (ipad charger, mobile Charger 1,2A, 3s Lipo Battery with 5V step down) - Same result. Any ideas?