One of my favorite features of Manjaro over Linux Mint is the network activity when I, and hopefully the system are not doing anything. To be sure I really don't know what Linux Mint is doing. If I was better with networks I should have used some tools (perhaps wireshark) to identify where the traffic is coming from. At any rate it's concerning and Manjaro by comparison is quiet. And this has been happening on Mint for quite a while!
Manjaro is a fresher install, so perhaps it's simply some piece of software I have not running on Mint that I have not yet installed on Manjaro.
A few minutes ago on Linux Mint (this is typical)...
And a few minutes ago on Manjaro...