If you have the user guide check the games settings on page 123. follow the instructions and check you have the memory to play these games. Lack of memory could be the cause and you don't have enough to operate the games hence it turns off then back on.
If you haven't got the user guide go to www.Nokia.co.uk select 'mobile phones support' under second picture down on right of page. Centre of next page under Support services selct 'user guides' on the next page that shows select your telephone from the list clicking on the box of user guides for phones. pick your phone then right click on the 'go' button then follow any instructions then watch the download [you may have to right click twice.].
BOB
February 2005