I got a brand new iMac 27, but the wireless keyboard that came with it was doing strange stuff. By itself it would send a F5 key stuck if untouched for 5 minutes. I've tried the keyboard on others machine (Mac Mini, iPad, iPhone, MBP, MBA), still having issue. I brought it to the shop where I bought it, no problem... They still gave me another one.
The new one is typing any BS when I type on it on the new iMac, some keys get stuck also, it is typing by itself. I've tried again with all the other devices I have at home and at work, same thing. I bring it to the shop, no issue...
So I don't get it. From all the things I've tried, I can't confirm that the issue is the keyboard, the machine or the location.
The only common things within all the things I've tried is ME. But I asked some colleagues to type and they had the issue also, so it shouldn't be me haha.
Any idea what I can try more?