occurs

the error occurs frequently during peak hours.

a rare astronomical event occurs tonight.

the problem occurs most often with older software versions.

a change in weather patterns occurs seasonally.

the system failure occurs due to a power surge.

a significant opportunity occurs with this new partnership.

the mutation occurs randomly within the dna sequence.

a critical security breach occurs if the patch is not applied.

the chemical reaction occurs when the catalyst is added.

a positive outcome occurs if the project is well-managed.

the data loss occurs if the backup is not performed regularly.