Tesla Motors Club

I noticed my charger is reducing the rate of charging about half way through a charge. I just got back from a trip with about 5-10% left and plugged it in, i'd say a for a good 2 hours at least it was charging at 48A.. but since then its been at 34A, its at around 232V now too.. i'd say at around 40-50% of the battery charge it did that... Not sure why it would reduce so much, went from like 40mi/hr to 26mi/hr