Ursula Lyons found the card problem "annoying and embarrassing", after experiencing issues at a cash point and accessing her online banking account.
But Tracy Pomphrey said: "Myself and my mum had our TSB cards declined in Asda, it was extremely embarrassing. Although we could go out to the cash machine outside and withdraw the cash!"
Hayley Jane said: "People saying they are glad they're with other banks, but they have all had this problem at some stage - Natwest had this problem last year for ages!!"
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Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.
Top temperature 24C/75F.