Is something terribly wrong here?

My iPhone has been behaving very oddly the last week, & I don't know enough about any electronics to understand it or know if this is something serious. Whenever I'm online, my phone will switch back to the home screen, and I'll have to start over. It happens several times, just recently six times in one hour! Can any tech-savvy person, which I'm not, tell me why, & how to correct it? Or do I just need a new phone? I hope that isn't it; right now I can't afford an upgrade.

Hard reset, look up how to do it