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Hi, I'm Mike G and I'll be assisting you. There are 3 types of possible low voltage light switches. The type depends on the type of relay used. There are 2 type relays that are found in a control panel and one type found at or in the box the light fixture is connected to. Tell me the number of wires on the switch to know what type of system you have.
OK, having a 3 wire switch, remove the switch and touch the wires together 2 at a time. you have a common and 2 function wires. If you get the relay to operate correctly you'll need to replace the momentary switch. If no function, replace the relay.
Do all the lights function properly when the transformer is working?
To overload the transformer either one of the relays is holding or there is a short on the feed circuit to the relays. At this point I'm going to opt out and make the question available to other experts for comment.