My Macbook pro (early 2011, upgraded to 10.11) started behaving strangely lately. It started randomly crashing multiple times of the day, and the only information I've been able to find is the following message in the logs.
Oct 26 10:07:01 localhost kernel: Previous shutdown cause: -128
Any idea what might have caused it? I've looked up the cause code, but it didn't provide me any additionl information and I couldn't find anything online.
Edit: I did two memtest runs and they both returned no errors on the memory. I've also tried swapping the memory banks around without any improvement. AHT same thing, doesn't find any error.