The station sits in open water, and its isolation was a frequent cause for complaint by keepers, and staffing was difficult.

This has been a frequent cause of criticism, although it also contributes to the product's stability.

Overexposure to these pigments was a frequent cause of accidental poisoning of artists and craftsmen.

Cathode depletion was uncommon in signal tubes but was a frequent cause of failure of monochrome television cathode-ray tubes.

The border crossing, which had temporary status, was a frequent cause of bottlenecks due to lengthy customs checks and inadequate facilities.