I have had the same problem 3 times, same place in the program which makes me think there is a programming glitch.
In the 10-12wk FTP builder, week 9, day 2, during the 3rd 5-minute interval, I get a message that the ERG mode is unavailable. It happens about 2 minutes in. Bad enough to break an old man’s legs (72) when trying to hold 335 watts and it is like putting the brakes on.
Probably not my equipment as I have:
Computrainer Lab Version
Dedicated computer hard wired via ethernet to the router
I have no other issues–ever–on anything else.