I have been having a ton of kernel crashes on my CRS after trying to work with metarouter in 6.31+ (up to 6.32rc2 tested) and no outlandish setup is done on the guests. I just create the mr and proceed to virtualize an interface or two inside it and apply ip/routing settings. After wondering if it was maybe an interface that has weird settings (my mind is racing trying to get cleanest settings) this was found to be false as I created an mr and nothing was virtualized inside it but it still crashed.

One of the things I tried was netbooting the routeros install with 6.31 with a format of the nand but that didnt even work.

So far, things seem to work in 6.30.2

Emailed support on this and they state 6.32rc3+ fixes the issue. I have tested this and can confirm no crashes so far.