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My bank often blocks my card during purchases - what is the most reliable bank card? (UK)
This question is likely to be closed as a product recommendation request. But if you are willing to change the question a bit, perhaps to "How do I avoid having my debit card declined when I know I have good funds" it becomes a reasonable general question. And my answer follows.  I can tell you the same thing happens to those of us with credit cards. It can happen when your buying pattern changes. Suddenly buying a lot of merchandise, especially away from home. Nothing like having your card declined while with relatives you visit or while on vacation. I'd talk to the bank and ask for advice how to avoid this. I've called my card issuer to tell them I'll in X city for these dates, to expect charges from there. That seems to work well.