Minimal is a safe app.

Minimal has loads of functions and is integrated with Tasker, this is why some Anti-Virus apps may raise alarms.

Minimal is uploading weather data in the background in periods you can set in the Settings Panel – therefore some apps may recognize it in wrong way as a threat, it is wrong! Minimal downloads data for you and based on your settings. It is the purpose of the watch face with weather info.
Don’t worry – minimal is very safe application and it totally depends on you how it works and what functions you want to use.

  

Such Antivirises can be wrong… 

Do you consider Instagram as a virus? I don’t think so…
Why then Norton is marking it as risky/virus application?