Maiden Hair fern frond

A mystery at the dairy has been solved. Each cow wears an ID transmitter on a cloth around her neck. As she walks into the parlor, the transmitter registers on the computer and the amount of milk she gives is recorded. In the last group of 85 cows, some of the transmitters stopped registering. There would be 2 to 4 each milking but only in that last group. The herdsman replaced the bad transmitters but by the next milking there would be other cows (or sometimes the same ones) that failed. The facts we knew: the motherboard on the computer blew and the whole system had to be restored just before this started; new florescent lighting had been put into the pen of the last group just before this started; many of the transmitters for the last group were from a brand new batch just purchased recently; the failed transmitters that were taken off the cows seemed chewed up on one side; once a transmitter failed, it wouldn’t start working again as they sometimes would normally. There was more that went on during that time period but we were able to prove they weren’t the problem. Figured out the answer? Will give it on tomorrow’s entry.