Had an Adsense account banned in January with $15k credit taken days before payout date (After 8 months of $2k-$12k earnings history per month) and extremely lo

Had an Adsense account banned in January with $15k credit taken days before payout date (After 8 months of $2k-$12k earnings history per month) and extremely low RPM&CTR. No answer to appeals, no explanation other than the vague phrase 'for policy violations'. :/