like i said, it's never about the app or what bank/what card u use

try scan 15-20+ transaction per day and see what happens tomorrow, suddenly you'll realize your card got blocked or being limited use
i also scan like 20 transaction on the 1st day, the next day i'm limited to 5 transaction a day and thn ultimately the bank block the card completely after i lodge a complaint with the bank

because i also understand that's not our our card works for the rest of the world, we only use it for meal and big priced items...max also 5 transaction per day
but not in china where everything is 1 transaction no matter how small the amount is.....so the transaction accumulates and the system will flag as unusual activity

at the end, i had to lodge a formal online complaint with BNM to get the card to unblock because the bank ignore me completely

i don't think this is a specific bank problem
it's an internal safety system/alert that isn't publicly announced to prevent abuse

when we use our CC in normal world, we would never use it like we're in china but sadly that alert system is universal(they didn't create a separated alert guage specifically for china transaction)

that's why all this years even until today you've heard people's CC failing in china and advising people to always have secondary and third payment option incase first one failed and i found out why