"Network security guard", "cooling phone" and "drink water" popup on android Samsung phone?

Is this some kind of malware? It's been popping up on my mum's phone for a few days and I can't find what's causing it. I can't find any info online apart from one person having the "drink water" popup but they weren't able to find the cause either. Should I get her to factory... show more Is this some kind of malware? It's been popping up on my mum's phone for a few days and I can't find what's causing it. I can't find any info online apart from one person having the "drink water" popup but they weren't able to find the cause either. Should I get her to factory reset the phone?
Update: Another example
https://i.postimg.cc/hPYFH44N/455104048-474051.jpg
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