unpaid amount because of invalid traffic

Hello all,
Especially for the last 2 months I see unpaid amount because of invalid traffic on my account balance.
Since I don't use blackhat seo methods, or buy traffic with money, I could not understand why these invalid amounts are increased tremendously
Could you help me to figure out what might be the reason?

Thanks in advance

 

So where is your traffic coming from?

 

Organic search especially from Google in general, and links
social media is not a deal

 

what % are we even talking about? I regularly get about 1% invalid traffic, but its been as high as 3% for one recent month.

 

Yes, it was around that amount
But last two months it increased to 30%
And this month, I believe Google somehow decreased my income by applying a policy(?) ..I don't know

I read the help documents at adsense web site, but these does not guide me where might be the issue...

 

Best bet is to load google analytics on your site and see where your traffic is really coming from.

 

thank you, I'll check it in detail this time