I've had this exact thing happen with my 2012 15" retina. Won't lay down flat and clicking the trackpad required pressing really hard. Had the battery replaced, works like new now — on Mojave, I'm not updating to the dumpster fire that is Catalina.

My old mbp swelled up enough to shatter the trackpad glass. During zoom calls it would overheat and swell and disable keyboard and trackpad function until it cooled off.

I'm on my second swollen battery in my 2015 15" MBP.

Java dev though so my computer is always near the temperature of the sun's surface which I think has something to do with it. We purchased 5 of these MBPs on the same date and the other Java devs machine is swollen while the testers machines are still fine.

Very. It has happened to me so many times that now whenever I travel I always take a set of pentalobe screwdrivers with me so I can remove the back plate of my MBP when (not if) this happens to avoid structural damage.

pretty common occurrence, in my experience. if you own a macbook, it is just a matter of time until the battery swells up and needs to be replaced. usual first symptoms are that the trackpad can't be clicked anymore.