6"gig" ? You could have written GB instead
I would check to make sure the batteries are of good quality, same batch, if rechargeable, then make sure they are capable of a high mAh rating. 2000mAh seems to be the lowest I can find in the UK.
The other thing is the internals of the keyboard could be screwed, or shorting, giving a wrong scan code
Thank you, I bought another brand of batteries and it seems to be working normal now..