complete game freezes

[Boilon]

Lately I have been having quite consistent game freezes. My game would look as if its playable ( i can move around) but I cannot cast anything, as if I was disconnecting or something. I generally have to quit my game out altogether and re log in to the server. This has been particularly frustrating when it has happened while fighting enemies and I end up dying due to this freeze. It happens upwards to twice an hour, although some days it doesn't happen much at all. I don't know what is causing this, I don't generally run an active anti-virus so not sure what is causing this problem.