This is an FYI as I fixed my unit. Lymow one from the kickstarter.
About a week or so ago I started noticing my mower wasn't finishing jobs it normally does. It was sitting on the dock charging longer than usual as in back to 2.5 amp 6 hour charging sessions or longer.
I timed the % per minute charge and came up with between 3 and 6 minutes per percent. Typically the 10amp gives you a percent a minute.
At first I thought it was the dirty contacts but no I was cleaning those often enough. I came across a post discussing similar things and one member alluded to the charging spades that connect to the dock charging paddles were potentially loose.
I took my dock apart and noted one of the feet was really hot and the other wasn't. I examined the connectors and noted burn marks on the shrink wrap. I removed the spade and did some light sanding and re-crimped the spade back to the charging connector and put some dielectric grease to reduce arcing.
It worked! Speeds ramped right back up but now the other side was getting hot too. Pulled that one apart and did the same process.
Now both are charging and don't burn my hand.