iPhone alarms are usually silent and do not vibrate.

This has been an issue I’ve had off and on for several years with iPhones, but lately it seems like it’s gotten worse. More often than not, my alarms make zero noise. I had to go buy an alarm clock months ago because I couldn’t trust my iPhone’s alarm. It’s gotten even more unreliable since then. That’s not good. I’ve noticed the alarm I have to end my sleep focus at 5:00 never makes any noise and doesn’t vibrate. Other alarms are hit and miss. This evening, for instance, an alarm I had to remind me to do something didn’t ring and didn’t vibrate. I checked and it isn’t set to “none” for the sound. Neither is my sleep alarm. I just don’t know what to do to fix this.