Yes with multi core PC I was having long time ago kernel problem but I m using RB800 just for p2p Link
no special config just AP bridge<->Station WDS no firewall...
today I upgrade to 5.14 this show up bad-blocks: 0.1% (if this is the case but I m not shure)..
All my x-86 dual-core machines have problem with 5.x. One machine runs fine on 5.12 now, but another machine of same type will not. I put it back to 5.6 and it ran for ten days, then locked up. Had to power it down to fix it. This is very frustrating. I've been using Mikrotik since somewhere around 2002 and have been a big supporter, but lately between this and RB450G capacitor problems I am afraid I am going to start losing my customers. I wish they would be more careful with the products/versions they release. Seems like every O/S release fixes something and breaks something else. And now there is talk of V6.x? Crazy!!!