Getting Invalid or Corrupted Pdf File only sometimes using Blob or Unit8Array as source

[Satyabrata-Pal1]

Usage is as follows
ngAfterViewInit(){
this.PdfViewer.pdfSrc = this.url;
this.PdfViewer.refresh();
}
ngOnChanges()
{
if(refreshRequired){
this.PdfViewer.pdfSrc = this.url;
this.PdfViewer.refresh();
}
}

Thing is the pdf loads fine most of the time, but sometimes it gives the error - Invalid Pdf Structure
On checking the get request for the blob , it returns 200Ok
But the response has a Html page and the pdf does not load.
What is the solution to this?