I was using siyah and switched to neak but both seemed not too stable to me. After I flashed to nightly cm9 i9100 0420 without flashing other customized kernel and I faced sleep of death twice in the middle of the night and for the past three days. So yesterday thought that must to do with their kernel, so I flashed back to siyah. But in the middle of the night when my phone totally in deep sleep, but my i9100 also sleep in death. Does anyone have the aforesaid problem any solution can help? I just flashed to neak latest version 2.0.3x and see when this problem occurs.
One more thing, after flashed to neak or siyah. When everytime I make a nadroid backup in CWM mode, after choose restart the system and it will stuck in rebooting messages.
Edit: using custom kernels can cause problems, even after flashing back to the CM stock kernel as init.d scripts, etc... may not be removed and may cause conflicts, if you are having issues do a full wipe including factory reset and install CM fresh, if you still have problems after that then it may be CM related.