Telia ISP - My ping is doubled, what to do?

I have the same issue since a couple of days ago. At first I thought it was my own connection but that doesn't seem to be the case when looking at this thread, but also when talking to other people in the community. I usually have 6-10 ping but now it's between 23-28. It's not too bad personally but of course I want the best ping that I can possibly have.