Wi-Fi taking up lot of memory
I think this is a normal situation as well - see my answers here:


Why is my Wi-Fi process using 3GB of memory?
Why is my Wi-Fi Process eating &gt;2GB memory


I don't think there is any leak or issue on Apple side - just some programs you run open lots of connections and if they have bugs or you have more tabs open one day versos another and the specific web pages with trackers in the hundreds can really pile on - so the explanation could be more about what specific requests are made each session you use your Mac.