I had a similar experience with Namecheap. Their bot crawled my website while it was still under construction and apparently reported it to some security databases, causing my domain to be flagged as suspicious.

Since then, my domain's reputation has been affected, and I often get security warnings when trying to access my own website through my company's VPN.

Namecheap simply informed me that it had been a mistake, but the damage was already done, and the issue still persists.