21.   A problem had occurred with the equipment on Monday and ScottishPower had been asked by Strathclyde Regional Council to help.

22.   With the increasing growth of the futures market though, it is likely that such problems will occur again.

23.   A likely reason is that he plays safe, sticking to his present supplier or model in order to lessen the risk of aggravation should problems occur.

24.   Also print out or jot down any error messages that pop up when the problem occurs.

25.   Analysts pointed out that bank credit problems occur in cycles closely linked to the health of the economy.

26.   And wherever US bases have been located around the world, similar problems have occurred.

27.   Anderson said most problems occur when escorting a boxer from the ring to the locker room.

28.   Another problem occurs when storms, or seals, damage the salmon pens and thousands of the farmed salmon escape.

29.   Another problem with screws occurs when the screw strips its threads.

30.   AOL officials said the problem occurred during routine maintenance of its computer network.