Notebook freezes 5-20 minutes after restart. How it looks like: Cursor in state of rolling colour circle, you can move it on the screen, but there is no way to stop it except hard reset (5 seconds at power button). Mac OS X test shows no errors of SSD, Apple Hardware test also does not find any error (repeated test many times). What is interesting: when I installed Mac OS to external USB Stick and started system from it, system works without freezing. First idea to change SSD, but there are no errors in it according to Apple Hardware Test and Disk Utility. Any similar cases or idea how to solve it?