Transformer Woes

[RobertInOntario]

When I got back into model railroading around 2005, I bought two new DC transformers. Both were by Railpower, one was a Railpower 1370 and the other one was slightly weaker. Well, the weaker one died about 2-3 years ago and I replaced it with an Athearn transformer. (The Railpower 1370 is still going strong.)

This Athearn one has worked well -- wide range of control, especially at slow speeds, etc. -- until just recently. Tonight, it stopped working for a bit then started working again, although it seems now I have to turn in up higher to get the trains to run at their usual speeds. I've also just started to use this transformer to power a switch on a turnout, so I'm not sure if I'm putting too much extra strain on this transformer by using it to power this turnout switch as well as to run the trains.

The throttle / handle of the Athearn transformer also feels a little loose, like something inside it needs tightening.

So, am I somehow extra-hard on transformers or do they only last for 2-3 years before they burn out? (In terms of use, I usually operate my layout(s) several times a month, ranging from 1/2 hour to 2 hours.)

Thanks,
Rob