I have just done a faor bit of testing with the Ergomo Pro - have you changed anything before the readings went haywire ? (re installed BB for example)
havent changed anything.
Is the offset the same now as it was before the problem ?
offset used to be around 902, now its either 920+ or around 860. I did an offset this morning-was around 860, still gave very incorrect readings-around 500 watts around the carpark, I did the offset again and it showed 920. After that I was getting readings of 1400W just turning the pedals over easily
If not then I would return it to Marco Swart at Cycle Tech ASAP for a check up.
I think thats the best option, thanks for your input