@_ktg-yjm5t99FYI. I'm sorry but the text file is only a backup of your host file (that's why extension .BCK was added). So any changes you apply in there is not really usefull, since nothing looks at that file
What I did was I simply deleted the Windows hosts file. The hosts file can be found in the directory c:\Windows\System32\Drivers\etc\ (Image Attached). After deletion, the hosts file will reappear with the original commands that came with the device. This basically resets all your hostnames and your IP address redirection settings and should hence allow Spotify to contact the respective friend server without an issue. Note; this will not harm your pc in any way.
The most likely cause of this issue is that you may have added some additional text to the host file or that there has been some software that has. This may have interfered with the servers that Spotify contacts to receive information about your friend feed.
If you know that you have made any customisations to the hosts file then I suggest you backup the hosts file to your desktop. Then after deleting the hosts file, you can add your customisations back to determine the section of text interfering with the Spotify friend servers. If you do not recall making any modifications to the file then just ignore this last part and delete the hosts file.
I know how annoying this problem is, and I hope this solves the problem.