Blade 15 Random Keys not working

Hi My Blade 15 has just started to not register random keys when pressed. D,4,5,K,O are not registering when pressed but all other keys are working fine. Is this a known issue or been seen before? I cannot understand the reason for this. Ive installed all the drivers and as mentioned the other keys work fine so this feels like a hardware failure to me. Nothing has happened that i know of that could cause this, its on my desk everyday and doesnt move. Im hoping this is a simple fix but ive tried the obvious things , drivers, reboots, reinstalled Windows but still the same issue and same keys not responding. I think its out of warranty now so cannot get support from warranty. Any advice is appreciate. Rob