OP-1 rotary encoder unresponsive when charging the unit + unstable calendar

Hi guys, I have bought my OP-1 about a month ago and what I realized recently is that the 4 color-coded encoders become unresponsive when charging it with empty battery. So far it hasn’t happened when the battery is charged. Also, the calendar is out of time each time a new preset is saved. Is there a cure for that?

Thanks a lot beforehand