Everything keeps getting defaulted

This isn't a big problem and there are bigger problems out there, but this bug is annoying me. One day my client had to restart. After it restarted, everything but my item pages were defaulted. My rune pages, my client settings, my in-game settings, emotes. If I close my client and open it again, everything is defaulted. I thought maybe leaving the client on might help, but it always has to say that is has to restart. Again, this isn't a big problem, but it's annoying having to set up my rune page and my in-game settings at the start of the game. I thought it could be because I have no more space on my computer, but that isn't the case. Any help would help. Thank you!~~