Lol, laughing through the tears. Your text here looks exactly like mine - Frankenwords created when the cursor jumps and I'm tying so fast several letters get added before I notice.
So, I took my laptop in and they replaced the whole top part including battery. Got it back and... within an hour, happened again. And several times since. I do go sometimes go several days without it, then I'll have two in quick succession like you do.
What's really frustrating is that of course there were no detailed notes on the repair -- whether they actually found anything wrong, whether this is in fact an ongoing problem - and the "geniuses" were all just "I only work here, don't know what they did remotely". So no sense of whether I should go through this again, which I'm not really inclined to do, don't want to put my laptop through another repair and I also really need it now, heading into an intense school semester (professor). But I've got only 4 months left on my warranty, so I'm really struggling with whether I should try again while I have the (free) opportunity.
Really this lack of guidance and feedback is what's most frustrating.
I'm on a 2015 MacBook Pro 13" retina; pre-touchbar. I bought it new in January, though an older model. You?
My escape key is nowhere near my pinkie... I've been trying to observe how I type in case I hit something and make this problem entirely myself, but I have yet to observe anything and anyway I was on an older but same size Mac for years without a problem, so can't imagine its my technique. Maybe the mouse pad is more sensitive to the balls of my thumbs? My husband has same model though, I worked on his no problem...
Again some guidance on all this would really be invaluable.
Its stressful.