Well, dang!
After a little sewing machine oil at the arbors and a little lithium grease on the pallet, my clock has been running reliably since Saturday. I stopped it briefly on Monday morning, and after that it's been keeping perfect time. This coincided with our AC being dead since Friday, so the home was more than 90-95°. Today the AC was fixed, and the inside temperature is approaching normal (78°). When I checked the clock at 18:02, it had lost 10 minutes (see screenshot from my camera), and an 45 minutes later, it had stopped. Any clues as to where to concentrate on looking for the increased friction?
There appears to be two issues, the clock runs slow, and the clock randomly stops.
Running slow may be completely normal due to the large temperature change. PLA (plastic) has a fairly large temperature expansion coefficient. It is not normally an issue in a heated and cooled house. If there are larger temperature variations, then the rating knob would need to be adjusted a few times per year.
The random stopping needs more information to help with the debug, otherwise all I can say is "repeat the debug steps listed in the manual". The key detail is the characteristic of the escapement. If it is energetic, then look at the pendulum support bearings. They may need to be rinsed in alcohol. If the escapement is sluggish, then look into the gear train. There are lots of gears and it could be any of them.
Steve