I had a 2012 mac with a new 2 TB Solid State drive-and had no trouble. I have no idea where the problem is, but we need to make more noise about this.

In outlook, word, and websites, using chrome, safari, etc. Finally sent me a new MBP in May 2018, and the jumping around is still happening. Also, couldn't read my WD drives for MAC USB adapter not recognized MAC replaced the trackpad, all connections, everything. They then tried to tell me it was a problem with my apps or files were corrupted and so we reloaded everything from the original sources. First the geniuses said it was jumping around b/c I was touching the huge track pad, then they said it was the jewelry, I took everything off.

I stopped using it and went back to my 2012 MBP. I had the same problem with the MAC from Sept. I know there's a dust issue with some keyboard people have had but this is more for typing and not a jumpy trackpad. Tell them to type on it until it happens to sounds like a bad trackpad to me, make sure they address the cables to and from the trackpad/keyboard too and not just the trackpad and keyboard themselves. demand they replace or fix it again, especially if it's under applecare warranty. THESE options are more for older macs as yours is basically brand new.

If none of the above, you could open it and check the connection and make sure there's no corrosion or any moisture related anything on the plug in where the trackpad has it's connectors but if it's new and no liquid damage has ever occurred then this is prob not a cause but possible if it's even got wet too. Some can be adjusted VERY little but just enough (search here for this) But yes, it can be one of several y these first.they're the easiest. Could be several things, reset the PRAM.also check the cycles on the battery under system information/power if it's REALLY high like near 1000 it could be a bloated battery which pushes up on the trackpad and keyboard and causes this.also check the adjustment screw for the trackpad.

Macbook touch pad bouncing