Really Delayed stream to iPad

Hi all

I've always used my old iPad mini to stream the Nanit, which is now at its max IOS update of 15.5.5.

In the last couple weeks (max) I’ve noticed the stream is really slow, compared to what I can actually hear through the wall or on my phone for example.

I know Nanit said they weren’t providing updates for certain IOS and below (which I think included my iPad). I think this is really unfair firstly, because the hardware I choose to watch it on factored massively into whether we would buy it or not. Now we’ll be forced to use our phones which is something we never wanted to