iPod touch 5th Gen keeps freezing

Yesterday I was using my iPod and it suddenly wouldn't turn on. My Home button has been broken for at least 6 months, so I use the Sleep/Power button to turn the screen off and on. Suddenly it wasn't responding. Luckily, the iPod was almost dead so I let it die and that reset it. Today, it has done it again. I don't know where this is coming form but I use my iPod for most of my daily life, being on the movie most of my day and having to answer emails on the fly. I do not know what to do to fix this. I can't do a hard reset because of the lack of Home button. This has happened once before, months ago. Is it an iOS issue? Or is it something else? I can't afford to replace my iPod right now but it's well past the expiration date for the warranty. Thank you!