Hi Patrick Judge1
Thank you for posting your experience in the Community.
Seems you have the latest software, and have tried the available trouble-shooting tips with no success.
If you haven't experimented with it already, you could try changing the sound that plays when the timer ends:
Use the timer or stopwatch on iPad - Apple Support
Eg says: In the Clock app: "Set the timer
- Tap Timer.
- Set the duration of time and a sound to play when the timer ends".
Else
You might want to try contacting Apple Support (online chat, phone, eMail etc): about this issue :
Contact - Official Apple Support
and / or
You might want to send feedback to reach those who work behind-the-scenes at Apple.
They will likely not reply, yet your feedback will reach those who can make changes.
If others are also experiencing the same issue, we may see the issue addressed in a future update.
Web-form for feedback:
Feedback - iPhone - Apple
All the best :-)