Looks like a typical disconnection. The problem is likely somewhere between you and the game server, which is what people mean by "your connection." The route taken for each game is different and it's not outside the realm of possibilities that you have a better route to those other locations. If you're playing on PS4, there's most likely nothing you, or SE, can do about it. Your ISP could possibly do something, but since you've already had technicians visit you, those options are likely already exhausted.

On PC you could possibly try using a VPN service to tunnel and more secure route to the game servers, but I don't know if those kind of services are available for PS4. WTFast, Pingzapper and Mudfish are a few I've heard about.

TL;DR: It's not your fault, it's not SE's fault. Try another ISP or a VPN service if possible.