Hello I have a strange problem. I assigned static IP to my raspberry - 10.10.10.120 (I did the same thing on my Mikrotik router). It was working perfectly until today, when I couldn't connect to PI remotely. Finally I saw that my router assigned another IP - 10.10.10.56, and I have access via that IP. Even if I delete assigned IP from router, and reboot the PI, router will assing the same IP.
Luckily I'm just testing my project for now, but this can't happen again later. Is this router or PI problem? I'm using wheezy OS.