xbmc problems

I have tried different raspberry pi's and tried xbian, openelec and raspbmc but each one i try gives me problems across all raspberry pi's. The problems are things like i will be using the remote then it will stop working also have different ir remotes powered by the pi's usb ports. Also sometimes it seems to always go up like im pressing up on the remote,

I have also tried numerous different power supplies and same issues

Also this is being on a fresh install. I have been trying for weeks to stabilize the os systems but always giving problems or the pi's are. Also they crash quite frequently. I believe they can be good due to posts on here etc hence why im not giving up on them but everyday seems a struggle trying to use one without any issues.

How are you ppl finding your's it be nice to hear off anyone who actually has no issues with running xbmc on thier pi's.