My two Tonieboxes show an increasing amount of blue circle, one box sometimes has a long white noise

My two Tonieboxes show an increasing amount of blue circle, one box sometimes has a long white noise.

I have setup the teddy cloud, flashed the domain and run it that way since three months. The blue circle is annoying. Around one or two times a week this white noise appears while playing and it last for around 10 to 15 min.

Any ideas?