I think You must check overview your backlinks that you have created in last few month may be there will a backlink that is from Malicious backlink for Google, As according to Moz few months ago my site spam score increase upto 5%, then my SEO team tries to reduce it, and it have taken a lot of time and still spam score is 2% which can be tolerable You can check out my Site, and what's your SPAM Score bro according to MOZ,
