[7.8] League client constantly crashing, being unable to rc etc.

During a few ranked games recently I've had problems where my ping spikes (from being normal all day) up to about 7000 then the client just completely crashing without warning. It seems to crash so quickly that the bugsplat doesnt even recognise it and then when I try to reopen my game it constantly gives me the error message that I cannot reconnect; 'check my internet connection' even though my connection is fine all the way throughout the whole process. This is about the 5th ranked game I've lost because the client just completely spazzes out and doesn't let me reconnect for no apparent reason. Has anyone else had this problem?
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