The reason why the song is stuck may be due to the following reasons:

There is a problem with the sound source. You can copy the songs to a computer or other mobile phones and play them.

Memory card problem, back up the required data on the memory card, format the memory card, and then play the song again.

There is a problem with the mobile phone system. If there are no problems in the above two tests, it may be necessary to upgrade the mobile phone system.

It depends on which model you have. All mobile phones released after the end of 2010 support online independent upgrades.

For mobile phones in the past, you could only go to the OPPO after-sales service center for help.

I hope the answer can help you solve the problem.