So I decided to start a new world with my brother on 1.8.9, but I've had one of the most bizarre experiences ever in my almost ten years of playing. Basically, I opened the world and for whatever reason he would be able to move around for a few seconds before the whole world would freeze for him. I could still see him moving around but he couldn't see any changes in the world. We both checked our firewalls to see what the problem was but so far nothing has helped and I really don't know what to do now. Also for some reason, as soon as I open the world, I can see my internet go offline in the corner of my screen and even my browser says there's no internet. Eventually we decided to test out a creative world and that seemed to work perfectly fine. Zero lag and I didn't lose connection to the internet. What is happening here, and how/can I fix this?