I have not experienced such problems with the Bank. But I have friends from other countries who have been facing exchange problems lately. Those exchanges that work with Fiat constantly limit the list of countries to which Fiat can be sent after the exchange. They are motivated by the requirement of KYC.
Good for you. Not asking for any details, but can you confirm that your inflows (i.e. from the crypto-gains translated into fiat to your bank account) have been "abnormal"? An example to illustate what I mean by that:
1) Assume you make USD 10'000 per month as a salary. If every few months you deposit 2k or 3k as a result of your gains, no bank would really care much.
2) However, if you started to deposit USD 15'000 every second week, or a lump some of say USD 1m from a crypto exchange, that would certainly trigger the alarm bells at many banks.
The second scenario is what I would label "abnormal" from a banks compliance perspective. And I would be surprised if a reputable bank would not react in such as case and demand some proof.