Solved
NETWORK DISCONNECTED - ERROR CODE 1:8600 1S:5 100 1S: 16054882630:-2146631680Q
I was playing fine. Suddenly it kicked me out of the game and this warning shows ever since... I tried different DNS (Google DNS), Verified integrity of game files, router off/on (wired connection), ...
I tried "Cloudflare WARP" and it worked. ✅
But using WRAP or VPN is not permanent solution as this slows my internet. But this helped me identify the issue.
I called my ISP provider and tell them about the the issue, my work around with WRAP and exact time (as I was in the middle of a game when it happened 1st).
My ISP provider understood the issue and changed my IP channel or upstream (i'm not sure)... Now it works. ✅
Another solution I got from steam coommunity - that he disabled NAT in his internet setting and it fixed his problem. ✅
