Multiple problems with my league (mac)

I am currently on a late 2013 iMac running a 2.7 GHz inter core i5 processor with an intel iris pro 1536 MB graphics card. In recent times i have been experiencing constant game crashes and i still can't find out the reason why. there doesn't seem to be any trigger but it happens very often, like every other game. A new problem that has also raised is that whenever i play ranked and only ranked i can't connect to the server, which it prompts me to try and reconnect which it doesn't. And when i proceed to close down the new tab to the game, the main league tab doesn't say reconnect to the game and yet it says showing game stats which is the end screen after you finished a game, this is however not completed and just goes to the main page in the league client saying that my status is online even though i am registered in a game. Due to this i have received many leaver busters even though none of these problems is my doing. Another problem that i have been been facing is that whenever i try to open league it gives a message stating that this application cannot be opened and i only opens when i spam the application to open. when it does it always says that it has recovered a recent patch and needs to update which takes another 20 min every time that i want to even open the application.

This post has been put up as i am looking for a solution to the multiple problems that i am facing and i am just sick of waiting 20 min due to leaver buster every time i want to play and i am just tired of my game crashing and ruining the game for 9 other players in the game.