English Law/Patents Law: Contract(s)

the phrase is taken from the termination clause in a contract:

13.2 Termination for Cause

13.2.1 Upon written notice either Party may terminate this Agreement in the event of a Material Breach by the other Party. The Party seeking termination will provide the other Party with sufficient, reasonable written notice of such Material Breach and provide the breaching Party the opportunity to cure it as follows:
13.2.1.1 In the event of any ====>persistent failure to pay any amount due and payable under this Agreement when due, at least fourteen (14) days.
13.2.1.2 In the event of any other Material Breach, at least fourteen (14) days.

13.2.2 If the breach cannot be fixed or if the breach is not remedied within the permitted time, the aggrieved Party may, without prejudice to any other rights which it may have, terminate this Agreement with immediate effect upon further written notice to the other Party. This right will not accrue in relation to unpaid invoices where Customer has initiated the dispute resolution procedure.


My question is:
(a) is this failure to pay for a long period of time, e.g. failure to pay for 6 months (FYI under the contract payments are made every month)
(b) is this a reoccuring failure to pay, i.e. the party is always late and fails to meet the due date 3..4..5 times in a row

anyone?