Client Closing Itself on Mac

I am currently running Version 9.15, and its having this strange issue where the client will just randomly close itself after about 3-5 minutes. Also sometimes when i open it, the username and password bar will be greyed out and it reads "We're unable yo log you in because you may be offline" even though im currently connected to the internet. I also already tried un-installing and re-installing the game. Im not sure if this is because im on mac. Ive been playing on my mac for years, and never encountered this problem. I currently use a mac mini 2011, with 8 gb of ram and a 1 tb hard drive with an AMD Radeon HD 6630M 256m graphics card. So my device can run the game just fine, its just the client wont stay open. Any and all help will be appreciated!