I don't have stability issues on my board, at least it did not show up yet but one thing i have noticed is my Guvcview app some times get weird memory corruption at startup (maybe i introduced a bug, still investigating), i don't see this happening on M64, this makes me wonder if DRAM timings is really correct or need some adjustments.
No other application has shown any memory issue.
I have done some minor kernel modifications on my customized build but nothing relevant.
Using arm-linux-gnueabihf-gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
One important missing info that may help you, i don't have Wifi/BT enabled and loaded on my own image.