[Mac] shop crash

Lately (all day today) if i enter the shop to try to purchase a champion, skin etc the shop is slow to load anything and if i stay in there for too long my client crashes entirely. I've checked everything to see if it was just an error with my internet but everything else is running fine i can run games no problems but i try to exit and leave the shop and it still crashes it. I've even sat on the main screen for about 25 minutes to see if that would crash it and it didn't.