Just so happens, I had success in keeping my last router going another year by changing the PSU. It was always hot, maybe it wasn't the one that shipped with it, don't know.
However it's a Linksys WRT-160N, and installing one from a Netgear that I no longer has did the trick, it had half again more amps at 1.5, the old was 1.0. The voltage was the same at 12.
Have since replaced the unit with a Linksys N900 (EA4500), it was their highest rated 'N' series, just below their 'AC' models, but with all of the speed I'll ever need, and dual band also. My only regrets, and this will only show in the future, it has a single core 1GHz CPU, the next level up (the AC) has a dual band 800MHz CPU. Didn't realize that routers had dual core CPU's until after the purchase, if I did, would have spent the extra $10, even though there would be no other benefit. Just because one has an AC router doesn't mean ISP speeds will increase. Only if the customer isn't getting those speeds will that matter, and in this area, I don't know of anyone who'll benefit from AC speeds. Maybe range or other router features.
At any rate, if it lasts 5 years, will be a happy camper. The WRT-160N lasted longer than that, under heavy use & I have no idea of it's CPU size.
The only negative about the Linksys E2500 that I can think of, is it's age, if placed in service at time of model release. New ones are still available, so only time will tell.