LOL Client NA keeps crashing (LOST MY PROMOS BECAUSE OF CRASH)

My LOL client crashed in between the ban while I was in queue with a friend playing ranked, League just suddenly froze and I was not able to do anything, I asked my friend what happened he told me I dc'ed my internet connection was very stable and I couldn't close the client I had to use task manager to shut the process because it was not responding, I open league again and I'm in lower prio so as I lost my last game for my promos, RIOT I hope you're trying to fix this issue this isn't the first time I haven't just reported about this. This might have been the 5th or 6th time. Thank you and I hope you fix this.