Packet loss is typically caused by network congestion.
It explains here what are the possible causes of packet loss and how to fix it them.
See more here
Hope this helps.
Have a nice day!
I've been having problems connecting on online games / having a lot of lag on them. I contacted a support for one of the games and they told me I was having these problems because of packet loss. And also my internet crashed a lot throughout the day and I don't know if that can be caused by packet loss.