I am getting error when hovering on document in sharepoint online "sorry there was a problem and we can't open this document.If this happens again, try opening the document in Microsoft Word"

 I am getting error when hovering on document in sharepoint online "sorry there was a problem and we can't open this document.If this happens again, try opening the document in Microsoft Word".I am sure that document is not corrupted and all. something it showing the preview and sometimes it throwing this error. I hope this error is intermident. When clicking on the link also it throws this error but on refreshing it working fine. I dont know why it is happening. Please helpme  to resolve this issue.