Always with the batteries...

Wireless sensors are a great idea, clean installs, no wires, etc. however they can be a real pain in the neck when the batteries start to drain. A good indication that something is wrong is when you are pedalling at a fair clip, you notice your speed drop and then climb back up. I wouldn’t think anything was wrong except for the fact that I’ve been riding a trainer and my speeds have been pretty consistant. Stupid batteries!