@Broadstairs, I am sure Ecowitt will come good (as others have intimated).
My WS80 (believed to be the new type) has random 60C temp spikes, despite being flashed with the latest firmware. It was purchased in the UK, not from Ecowitt
Emailed Ecowitt 10th Jan, to check that there was not still a firmware issue.
Stated that I was not too concerned, as I use a WH32EP for my main temp reading.
Included my 3 id's and a couple of screen grabs.
They replied on the 11th, saying that they need to send me a replacement T & H, And would I disassemble the shield and photograph the existing sensor.
This I did, and CC'd my UK supplier.
Almost by return, I had an Email to state that this was not one of the new units, and that they would arrange a complete replacement unit, would I supply the order number (screen grab of UK order Email).
Confirmation dispatch Email this morning (20th Jan).
Hoping you soon get a resolution.