Well, it could be because the map/server is being restarted. Wait a few minutes and then try again.
If that doesn't work I suggest you un-install and re-install the game - and be sure you delete all folders as you un-install it.
Good luck~
Maybe try and check your particles.
Go to the FeralHeart folder --> My_Objects --> Sky and look for any particle files with a _0 or _1 at the end - delete those.
Check the water reflection setting - and turn it off to make sure that that isn't what makes your game freeze.
Also make sure you have the right ActiveX download to make the game work correctly.