If you read the instructions they are clearly marked... for continuous loads blah, blah , blah... it's the bla, bla that you didn't follow. Most come switchers with a warning about heatsinking and soldering the area under the switcher IC to a heatsink a 12 mm X .5 mm piece of copper about 4 cm long bolted to an aluminum panel or heatsink. It CAN be soldered to (that's why there is no solder mask there). I've used several of them W/'O problems... as cheap as they are I just use one for every 1 - 1.5 A. A bigger switcher is probably better for you as someone else has done the engineering for you... I do my own, I don't trust others to do my work for me because it is frequently bad... Not so much defective work just that there is mo more work done except the bare minimum... I also used 1,5KE6.8 tranzorbs with my switchers "Just in case". My single point was to be that it is a lot easier to make it modular and distribute the voltage to the switcher than it is to use heavier copper wire to avoid I R losses. much smaller wires that cost less money and are easier to work with... But that's ok. I'm outta here.
If a power supply says 2A did you look to see if that was continuous, did you take a look at the Mfr's data sheet for the device and check to see what would be needed for 100% continuous duty @ max load for the expected heat rise.
I had a specific reason for suggesting the switchers one is that they can be used with higher input voltages where the efficiency is better. The project that "Failed?"... how much homework did you do or are you relying on other advice from the "resident" experts... I'm not here for fame and fortune, I am here to learn the language. I do however know how to do that simple "Due Diligence", making sure what i buy is workable and if not what it takes to make it right... Completely right. It's called experience and for the grief I get here It's frankly not worth my time. that number beneath my name isn't the number of times I have been here... rather it is the time I take away from time I would like to use to do my own work. I rather think in the future I will keep my keyboard quiet.
Doc...