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@GTP_Nail advice on running private lobbies. Public lobbies can become very unstable with random people jumping in & out.
We all agree that this game is full of bugs that PD will probably never fix. They haven't even made an attempt to fix any of the lobby issues and just keep making it worse with each passing update. Anyway I'm not going to go into a full blown rant about how much PD cares about it's customers but instead try to offer more advice to help you.
There are people posting here who run other leagues with some amount of success so I thought I would share what has worked for me so far as a host.
You should also ask your members to try and help by doing this too.
1. Always run a Private lobby and send friend invites to all your members
2. Delete your PS4 (cache) temporary internet files .
3. Reboot your internet modem.
4. Disconnect all electronic devices from your internet like phones, computers or anything running off your WiFi.
5. Do not have live chat going on during the race.
6. Do not live stream the race without a fast internet connection.
7. Hardwire your PS4 and do not race online by WiFi.
If you do not have a super fast internet connection then following these six steps will help your internet connection and should give you the best results as allowed from your service provider.
I would not attempt 5 & 6 without having an internet speed of at least a 100 mbps or more.
Just don't give up yet. I seen your lobby up today and it had 15 out of 16 players so obviously you have a series that people want to join and that's not always a given.