Only thing i would check my self is that no other clock or alarm app is installed. Remember the G5 does leave uninstalled apps for about 24hrs after you uninstall them. Its odd, i just turned off and back on my alarm and the icon does cycle. If anything go to settings, general, apps..find the clock and under storage, clear the cache or any data.
Did you accidentally start a timer or anything else like that? Open your clock app to make sure nothing is randomly running.
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I had Remainder app (shadow). But uninstalled it couple off days ago. That didn' t help me.I remember reading about a similar issue and the culprit was a note taking app (To Do Remainder I think). Do you have any app like this?