Ok so I ended up taking my Clarisonic Plus back to Sephora with my receipt despite the fact that it'd been way past the 60-day limit. They were so great and let me do an exchange and said they'd send the wonky Clarisonic PLUS back to the manufacturers themselves.
I waited to post an update just to be SURE everything was ok. So 1+ month into testing my new machine and all is well! It's gone strong on the 2 minute setting has been able to hold the charges with no issues :)