1.   And the ranch, which has some of most sublime mountain scenery in the West, has been a source of continual problems.

2.   One continual problem with such microscopes is the tendency of a small amount of water to condense in the tiny gap between the stylus and the object.

3.   The late reporting of trades, in particular, has been a continual problem.

4.   Despite continual problems holding his coalition together, Chuan recently expressed confidence that he could survive the political onslaught of his opponents.

5.   The base was abandoned because it was built in a valley and faced continual problems with ice and snow accumulation.