It's not the supplied charger or cable. Then cables can fail and many tablets charge slowly if whatever trick/mod the maker used to determine if the source was more than the standard USB 2.0 500mA capacity.
I usually leave my tablets plugged in when not in use to maximize battery life span. So are you telling us it doesn't charge overnight?
Less than a year old and recharging at snails pace what am I doing wrong or not doing right please? Oviously I turn off connection and get rid of some apps and turn off the whole thing and it IS properly plugged in and charging , just too slowly. Thanks