Waveform in audio randomly disappeared

[Evie3580852043vz]

I had this audio and imported for a week and have been working on the project all fine and now the waveform in one of the audio tracks has vanished. I have no idea why?

I can still hear the audio and have tried rendering the audio already.

Any help is highly appreciated. Thanks very much.

[Evie3580852043vz]

I had this audio imported* (sorry grammar mistake)

[Evie3580852043vz]

UPDATE: After just waiting around I tried zooming in and out of the timeline a couple of times and now the waveform has suddenly reappeared. But it then disappears when I zoom out again on the timeline.