crashing and no full screen

[Bl4ckdo9]

Im wondering if anyone knows how to fix the problems I have been having since I started playing the last couple of months I've been dealing with it for the love of the game but would really live to improve the experience.

1) full screen wont work for me I put it on full screen but seems like doing just about anything makes it go back to window mode. Like I said its not a deal breaker but I would enjoy playing in full screen mode giving myself more room and view. Not sure what is causing it...

2) Been having the issues of crashing during zones and camping. sometimes everything works fine I zone threw in seconds or I can camp change chars and go about my playing. But sometimes the zone will freeze me and make me reload the game putting me on the other side of the zone. camping is like a 80% chance that its going to crash out and I have to reload to switch chars.

if anyone can give me some tips that could help or tell me anything as to why this is happening would be greatly appreciated! thanks!