Had this reply back from My5 support.👍🏼
"Hi, thanks for your message and apologies for the problems you've been experiencing.
We have flagged this to our Tech Team who are currently looking into a spike of reports of problems on Roku/Now devices overnight.
They'll look to understand what is causing this issue and how it can be fixed as soon as possible.
Thanks and apologies again for the problems with this.
Customer Support Team | My5"