Suddenly high latency in BF5.

Since about 1 week I suddenly have a latency between 130-160 making it unplayable in online mode. Before it used to be between 55-80. I have checked my internet connection and it's all fine, it works perfectly in general but suddenly not in BF5! I have checked all pages on connection troubles and I have spent 3 hours in telephone with EA technical adviser and when it work ok for a test on two maps they closed the case as solved.

Now when I try to play online the issue is right back ☹️. UOtrace shows that all is fine with everything but the EA servers. I have tried Google DNS, it made it worse. I have flushed DNS and made several other things they said that I could try. But no difference!!! And I can´t even e-mail EA. 

I use a 4G connection and have the 4G router connected to the computer via network cable. And as I wrote earlier everything is fine except BF5 and it were fine until like 1 week ago.

Can anyone please help me resolve this problem? It drives me mad not being able to play this game without lags.

/Tobias