Hello.
I understand. The problem is that I only encounter this error with this specific game; I can play other games online without issues using my Wi-Fi—including Arma Reforger, which is from the same company—so I’m not exactly sure what the issue might be or how to resolve it.

I used my phone's data connection on my PlayStation and it worked—I was able to play DayZ properly. So, how can I fix this? What instructions should I give my internet service provider? Since my phone's network is much weaker and slower, it would be great to resolve this issue and play properly using my Wi-Fi.