Low Voltage Deck Lighting I Am Having Problems With My Outdoor Decking Lights. The Lights Keep Tripping When I Switch Them On??

I am having problems with my outdoor decking lights. The lights keep tripping when I switch them on?? - low voltage deck lighting

The lights Fiberboard (2 sets - are low-voltage) transformers connected to a power strip without water. It is approx. Cable 6-meter band on the wall inside. The lights go out when we go on holiday. However, when I plug the processor in an extension without any problems. Unfortunately, this is too big to seal the box. Is this a problem with power strips or 6 meter cable?