Hello Fellow Alta-ites,
I have a similar problem with my 2018 EX Serial # 54.
Fast charger gives an error "STOPPED 103" on display if I try charging when battery is above 75% capacity.
Thus I must get the bar graph below 75% for charging to initiate, then charges 100%.
But last time I charged it did a STOPPED 103 when it reached 75% capacity.
Have never updated software.
Looking forward to getting together soon with Alta Technician Maestro Superlative "One Lapper" to tackle and will report back...