That is a very strange problem. Thankfully, mine has had no such issue. The 2008 is a complete redesign and has very little in common with the 06 and 07 models. If you have the six-speed automatic transmission, there is a manufacturing defect in a part called the 3-5-R waveplate which can cause the transmission to fail completely. I am not sure if that is what is happening here, but if a dealer diagnoses the problem as resulting from the 3-5-R waveplate, there is a special 10-year warranty that GM issued on this transmission and GM will pay to fix or replace it. See this page for more details:
https://gm.oemdtc.com/1870/14404-transmission-clutch-wave-plate-2007-2009-buick-chevrolet-gmc-pontiac-saturn
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