This just happened to me for the first time two days ago! My vehicle wouldn't charge no matter what, because the scheduled charging pane just wouldn't load. Driving the car around seemed to fix it for me, I was able to plug in later that night and it adhered to the schedule. (I have 3 consecutive timers set, which gets me close to 70-80% every night. Still doesn't work great, but better than nothing)
Doing a screen reset (holding down power button) did not work. I assume a 12V battery pull would work, but wasn't needed in my case.
Once the scheduled charging bug is fixed, you won't need the Smart EVSE as the car will handle charge scheduling. I got a "dumb" EVSE to bridge the gap for now.