Do UV lamps weaken over time?

My lamp used to work perfectly since I got it in October…until a few days ago?

I noticed my cured polish is able to be dented (with my other fingernail). So I tested painting a swatch stick and the specific polish would NOT CURE AT ALL!! It was actually wet after curing

I’m so confused because I used this specific polish and lamp a few months ago and it cured perfectly. Everything I’ve used has cured great until just now?

I cleaned the inside, unplug/plugged it back, did all the troubleshooting online, I cured for 2.5 minutes, tried several brands, nothing! The polish is still able to be dented which was impossible a week ago?

I pop off all my old gel-X tips, and I tried scratching the old ones from months ago with my fingernail and they were completely solid, i couldn’t make a dent! So they cured fine

Is it normal for lamps to lose their curing effectiveness after only 5 months?