From the middle of February 2019, I started noticing drop in the traffic we generate for our website. I heard that some Google SE updates are around and I don't really know if my traffic drop is related to this unknown spam backlinks or due to an algorithm update.
Here is a screenshot from my GSC:
As you can see from the above, my website URL, the same kind of spam backlinks are also targeted at my other two websites.
All backlinks from theses suspicious websites are targeted at my most viewed and ranked content
Should I disavow from these links now ? or wait till google updates finish