Problem with Shuttle dimmer (SDIM-T-LED-500w)

Replaced a shuttle dimmer module that was giving problems. (all lights connected to the dimmer module would turn off after about 1-3 minutes). Replaced it but problem does not go away. The previous module has been working for 5 months without any problems.

Lights connected - 58 x 5W golf ball lights
Light fitting - 29 x eurolux optica pendant
Dimmer switch - Clipsal 10A 30series bell press switch
Dimmer module - Shuttle SDIM-T-LED-500W universal module (trailing default)

Wattage should not be a problem?
When dimmer module is bypassed everything works perfectly. Tested and inspected the wiring