I noticed that the number 9 key of my phone requires me to press it hard before it displays 9, w, x, y, and z. Similarly in the keyboard I noticed that the letter O and P don't respond well when I press them. Coincidentally the O and P are directly opposite the number 9 key. I started noticing this after I cleaned my phone and it's contacts with contact spray.
Are you guys also experiencing problems with your keypad or keyboard?