@Dorisma said:

It is possible that due to an old hard disk, the computer may not be able to open and play (readsf ~) multiple wav files simultaneously. One solution would be to add an SSD that would make the work of the computer system easier. But that would involve too much cost. I donțt use the audio wav files format anymore because it is difficult to read and causes many problems. Instead, I decided to convert on https://convertr.org/wav-to- mp3 all the files in mp3 format supported by any application.

I'll follow all your steps, but still, I am facing some issues.