Well, rule #1, never convert your bitcoin back to fiat. The banks and governments wants a cut of this. If you are trading, convert everything back to bitcoin, and keep it in this currency.
fiat is the most insecure thing ever, not because of theft, but because of governments. I'ts like their last grasp before we become free
Sometimes you have to have fiat or you need to hedge against a big drop in price.
If banks are freezing accounts it is likely due to huge amounts of money being transferred and them informing the tax authority that demands temporary freezing untill the funds can be explained.
Many exchanges have said they do that regularly.
It is no conspiracy but fact.
It's also why some guys got arrested by the FBI in Florida in a parking lot after doing a deal for 30k worth of BTC.
The link to banks is the problem.
banks have strict laws.. even with unlawful "crypto" coins.