Not registering hits and gun not firing!

Firstly, I've been running the network graph to see why my hits arn't registering and it seems to be the server that is the issue. On really good servers where I'm near top of kills and score with flags captured, it's registering for example client hits 4 server hits 4. However where I'm struggling to register hits, the client registers 4 hits, and sometimes at worst only 1 is registered on the server. Doesn't seem to be a client issue :(

On the other issue I've come across, there has been times even with a full clip my gun just wont fire in the heat of action. Usually after I've done a previous action such as throwing C4, a grenade or climbing over an object. Anyone else?

Thanks :)