Playonline Viewer Issue, need help.

Alright. So I have a weird problem. I use to play the game on my old PC and never had any issues except for lag in populated areas. i now have a new PC with much better components. I quit playing for a few years and just started up recently. I bought the collection set from Amazon. I can log into the game with out any issues. My problem is after playing for anywhere from 30mins to hours the play online viewer will just stop working. I dont receive an error code or anything just a message from windows that the program has stopped working and its checking for a solution. Its becoming very annoying for trying to party. Sometime ill zone or click on and object and it will do the same thing. I don't think its my graphics card because as i mentioned before it is better than what i use to have. Its a Geforce 240. Sometimes i know that its going to happen as all the sound will stop. people from my LS keep saying different things and I would really like to get this fixed so i can enjoy the game again. Please help.