Off topic: My iPhone is acting weird.

heyDaria
I don't know if this is a software bug, or my fingers are lazy, but when I type sometimes it misses letters or only types a few letters and then autocorrect changes it to something random and I don't notice until I've finished typing. It happens All. The. Time. 
I would chalk this up to being lazy fingers but it's only started happening since I updated my phone. I'm keeping my eye out for other weird bugs but it's mostly just laggy and doesn't type the letters I press on. 
Is it worth going to Apple and requesting a replacement? Or do you think I'll look totally stupid?