I am having all sorts of problems with my phone it keeps sticking

Sometimes turns things off like videos I am trying to watch but I can't send it back as I don't any other phone it keeps also when you unlock it a line goes through screen like a heart machine I don't get what's up with it but one minute its fine next its not oh and it's always saying like browser not responding plus other apps is their a way to make it work better or is it on its way out only had it a month.