I contacted Wahoo support. They said everything looked normal at their end, they can see I have the right firmware and that the spindowns were looking normal. They asked me to send a file with a 5 minute workout using the Wahoo Fitness app. I sent it doing 5 mins at constant 350 watts 85/90 cadence. I estimate I was outputting only about 200 watts.
They said they still couldn’t see anything wrong, but as my kickr snap was only 6 months out of (a 2 year) warranty, they gave me a discount on a replacement rear assembly (basically all the moving parts that attach to the frame). Replacement part is £150, they offered it to me for £80 and I’ve just ordered it. I think I paid £500 for the Snap 2 1/2 years ago.
Don’t know how old your model is, but thought I’d pass on my experience with Wahoo customer support in UK.