Microsoft has released a detailed report about some problems in Windows 7 including memory leaks and being frozen.
A memory leak happens when Power Manager opens an ALPC which stands for Advanced Local Procedure Call port and closes another port. The operating system should have closed the ALPC. The machine would eventually crash if this happen.
Another problem occurs if a notebook with a Vista, Server 2008, or 7 is put to sleep.
The third issue affects Intel 5 and 3400 Series with either Home Premium, Professional, or Ultimate version of Windows 7.
Source: Ars Technica
