Red Squirrel
No Lifer
Maybe try a different program. I use this...
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Clock | F-Droid - Free and Open Source Android App Repository
Alarm, clock, timer and stopwatch modef-droid.org
I've only had sporadic failed alarms with other programs(none with this) that were caused by recognized bugs, and were fixed.
Going to try that one and see if it's better. The default one seems unreliable and the issue I've been facing seems common even on stock android when I search it but there doesn't seem to be a fix.