Like several others on here I have a Cynosa V2, for about 2 years now. A few weeks ago my keyboard stopped working (no buttons, lights, synapse recognization) randomly while playing League of legends, I used a back up for a few days and it suddenly worked again! 
 

A month goes by with no issues and then it happens again.

I’ve tried all of the trouble shooting tips I’ve found, but no success. Doesn’t work in other laptops, but sometime will turn on for few seconds and then turn off again. If it was hardware it would never work, but if it was software then it would’ve been fixed by driver updates…. So I’m kinda lost on what to try next. Idk if Riot Vanguard has anything to do with it but I’ve seen issues with it blocking this driver, It just wouldn’t carry over to a new laptop without vanguard right?