Ok so I know a bit about this as I had the same exact thing happen to me in the past. The reason this probably happened is that their business was getting a high % of chargebacks from paying customers, paypal is not a specialist payment provider that wants to handle what they consider high-risk business like that, so they block your account and hold your funds for 180 days and during that time keep processing chargeb…
If you are at or above 1% chargeback you are going to get problem at any normal payment processor. Source: https://www.chargeflow.io/blog/chargeback-threshold-limits
Having said that, I think these days there are ways to limit your exposure, for example requiring 3D Secure for every card payment, as well as tools like Stripe Radar that help reduce fraud.