Audio Workstation

Guys, i use my pc for audio production and mixing, not gaming (i have a gt 710). I don't want to overclock. Should i buy intel i5 9400F or 9600k or other (only intel please)?. I want a powerful cpu that will last for years (my actual entry-level pc lasted 10 years). My config will be 32GB ram...

Problem: So just recently, during the past week, I've been having major issues with my Ethernet connection to my computer. First of all, when I first start up the computer, I always get the Limited Connection error for about 30 seconds, then it disappears and it states that it is connected...