Sounds like someone in your house is casting youtube from their mobile phone to your tivo
Welcome to the Community, this certainly is a strange issue and one I'd like to help to get to the bottom of.
I'd like top take a look at your account to check the set top boxes activity, to allow me to do so, could you respond to the private message I've sent with the requested information?
You can view the message by clicking the purple envelope on the top right of this page.
Additionally, do you have the Youtube app connected to any device in your home? Like your phones or the iPads?
Look forward to hearing from you
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Thanks for this information, I've tested the box and we're not detecting anything unusual at the moment.
Have you paired the acer pads up to the TiVo Youtube app previously?