Early 2011 MacBook Pro trackpad sometimes doesn't register clicks

[izzy0242mr]

I have an Early 2011 13" MacBook Pro and occasionally the trackpad requires a bit of extra pressure to register the hardware click. It sounds perfectly normal (I've tweaked the trackpad settings via the screw underneath the battery) and it makes the physical "click" sound, and the battery is just replaced so it's not pressing on the trackpad or anything, but sometimes the computer won't register the click unless I press a bit harder on the trackpad. Sometimes I'll mash down on the trackpad and hold it down hard for a few seconds and it works fine for a little while after, but then goes back to being slightly less responsive. Any suggestions on what the problem might be?