Hi I have had my Air 2 from new and from very early days had onboard keyboard issues. It has been random, though, initially just every now and then many letters in words or whole words missing so assumed was my typing style lol. Later though got more prevalent..but still erratic..sometimes carrying on for days or weeks sometimes OK for months. Not happening right now but it is a recurring thing and just found your site s thought would try and seek answer before happens next time, as likelihood is when really bad I can’t put together a message you’d understand lol Erratic response to typing..missing odd letters, sometimes whole words or duplicating letters or digits as though finger held down and inputting punctuation randomly where I was typing a word. Drove me nuts. But every time I tried to show someone Sods law, like a dodgy car, it would be fine. I took it to Apple store who were not interested in looking at me typing to see what was happening , just went straight in for a hardwear check which was fine, restored to factory settings, and sent me on my way. Of course it happened again and the thing is it would do it consistentky fir ages then be OK for ages then do it every now and then. I contacted Apple Care by phone several times and was being dealt with by supervisor in the end who wanted me to video typing, which is pretty hard when on your own and 5 attempts to get someone else to video of course it was fine, so I gave up with Apple and just put up with it. I’m in an ‘OK’ phase lol There is a previous post on this forum dating back to 2011 were the OP had same issues but seemed to be resolved by using Apple branded charger and leads. My issues started long before I ever bought third party equipment.