ringtone doesn't work

I have a custom ringtone I created about 8 years ago. I've used it for the 8 years without a problem. It stopped ringing when I updated to the iOS version 11.

I had hoped that by updating to 11.1 the problem would be fixed but it didn't. I just downloaded 11.2.1 and that didn't help either.

It should be noted that the ringtone shows on the phone on "Sounds" under "Sounds and Vibration Patterns" and that when you click on it, it makes the sound.

I have clicked on "download all purchased tones", that hasn't helped.

Here is the info from the ringtone file:

Purchased: 2009

Fairplay version: 2

encoded with: iTunes 8.2.1, QuickTimes 7.6.2

Profile: Low complexity

Channels: stereo

Location: iphone

Size: 1.1MB

Suggestions? Thx