Battery problem
If the block is not connected to usb charger att all times, the probes discharge in less than 24 hours. If the block has AA-batteries, and you forget to plug in the usb charger the probes remain charged for a couple of days. Then when you are ready to cook, you have no battery in the probes and have to wait at least 5 hours charging the block trough either battery or usb charger.
I guess this is by design. I thought the probes fell in to some kind of sleep mode or other battery saving mode when they are inserted into the block.
Sorry but this behavior makes the block not worth it at all.