Function app consumes a lot of resources event when functions are not triggered

- Function App version 1.0
- Function App name: https://btstaging-iot.azurewebsites.net/
- Region: SouthEast Asia

I have a function app with few functions. My function app is in consume plan (not App services plan). I develop and publish them from Visual Studio 2017 v 15.6.6. Today I have found out that the function app starts to constantly consumes around 60-70 Mb of memory right after I publish it from Visual studio. I also see constant in and out data (out is probably to storage account for logging). At the same time requests count stays at zero level (and I am not triggering this function by any way). This already resulted in increased bills for storage account because there were thousands of requests coming in (probably because of logging). Restarting the function app does not help. However, stopping it in the portal and then starting helps (still not clear if it helps in 100% of cases). Also, Application insights shows usage of 15+ servers. Again, I have to mentions, that all this happens when functions are not triggered at all.