very close to leaving league of legends

oey been playing since season 2 maybe... recently for some reason my com seems to crash while starting a ranked game not every game completely random I play maybe 6 games a night 5 nights a week some nights no crashes other's 1-3 out of the 6 I have gone through several measures to fix the issue... I play regular games it works fine 2,3 games in a row try a ranked and bam crashes at either char select or while loading into the game.. so I'm getting these leave buster's now it was first 5 min wait for 5 games...then 10...but now 20 mins I must wait before getting in an already 5 min que time, all for computer crashing.... I can restart com and get back in game within 5-10 mins and win the game but now they added a forfeit feature at I guess 1 min :/ so here I am waiting 18 more mins to join a que and I still have 4 more matches with this wait time....and if It happens to me again in just one game the next 5 matches will be 30 mins I imagine??? I like the leave buster for true afk's but I have never once left a game nor gave up on a match...so this wait time sucks