Galaxy S4 Return and Menu Button Unresponsive after screen replacement

[speedy thermal]

So, I recently cracked my screen on my GS4, and it was pretty bad. I replaced my screen, and now I seem to be having an issue with my touch sensitive buttons. Whenever I turn my phone on, they work fine and everything, however they will just stop working randomly, well they still work, except you have to push down on them extremely hard to get feedback. If you lock the phone and unlock it, they seem to work right again. So this makes me think it's a software issue. It's sort of annoying having to lock my phone if my keys don't work. Phone is not rooted anymore and is on stock touchwiz 4.4.2. Any suggestions? I'd rather not do a Factory reset, but if I have to I will. Any ideas?

 

[Sophia Zhao]

Check if your the cable for two soft buttons still connect well with USB board.