Confirm that the store accepts mobile payments. Contact your bank to find out if there's an issue with your card. Try a different payment method. Some terminals may not accept certain cards.
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If your contactless payments are repeatedly denied even after a Chip & PIN input, however, there's either a problem with your card or a problem with the store. Perhaps a malfunction of sorts, or it has expired, or there's an issue with your account.
There isn't a daily limit for the number of contactless payments. However, from time to time, when you shop using contactless payments, you'll be asked to put your card into the machine and enter your PIN to verify it's you, before you can use contactless again.