Glad it appears to be the temps.
However, if you ever suspect your battery is degrading, then you can use either, a cable, or a Diginow dongle, to check.
At the end of a ride, connect to your bike, and call up the BMS status from the menu, it'll list all the Cell / string voltages. Do it a few times over a number of rides, and if your battery is degrading, you'll probably spot a single string of cells is under performing. If so, then its time to call your dealer and talk about the batteries 5 yr warranty
I've chatted to LEAF owners on this subject, something that they are doing is to find the weak cell, and get *just* that cell replaced, its far cheaper, and more effective than replacing the whole battery. I know thats harder on a Zero, but it shows that a complete battery replacement is not going to be a thing with electrics, but more a case of replacing parts of the battery instead. After all, you don't replace the entire engine of a car if the spark plug is weak...