The most annoying thing was that this was due to me changing my home router, which triggered an IP switcharoo from my ISP. Because it was a rarely used account

The most annoying thing was that this was due to me changing my home router, which triggered an IP switcharoo from my ISP. Because it was a rarely used account Google freaked out. The more I tried to prove it was me the more it started sending me angry notices that it detected malfeasence and then boom.