Our channel has seen a strange, inorganic and dramatic drop in starts and hours 25th26th January, anyone else experienced a drop in reported figures.
They can't be correct
You've posted to a forum for Roku users, where few, if any, will be able to help. The Developers forums are a couple of doors down the hall: https://community.roku.com/t5/Developers/ct-p/channel-developers
This thread might be of some interest to you.