iPod touch screen wont respond to touch
About 2 days ago, my iPod started acting weird. I would unlock it and then after a few minutes of using it, the screen would stop responding when I touched it. I could still use the home button and it was never frozen. It was annoying and happened every time I opened my ipod, whether it be 15 minutes later or 5 seconds. When I restarted it, it went away for a couple hours. It did come back, however. Then last night, I was flipping through Pinterest when all of a sudden it stopped, as it usually did, but when I restarted it, it wasn't responding to touch. The home button still worked. I tried everything and even waited a few hours before restarting it again, but it is still not responding. I can't get into my iPod because I have a passcode and it wont let me sync it because of the lock. Any ideas on how I can fix this? I have it updated to 8.4.
I have had my 5th generation iPod since Christmas of last year, and it hadn't given me any problems up until now. I did crack the screen two months ago, but it was fixed through iCracked repairs. It could be a hardware malfunction, but I just wanted to see if anyone had any thoughts on if it might be caused from the update or some other technical thing.
iPod touch, iOS 8.4, 5th Generation