Deleting item from Sharepoint Online list throwing the exception.Exception from HRESULT: 0x80131904

Hi,

I am using pnp JS Core library to delete the items from a SharePoint list, which used to work fine all the time. All of a sudden, we are receiving the following exception

For example, if I have 10 items in list, when i execute below code snippet, it deletes 2 items from list and it throws above error for 8 items. If i run again it deletes 2 more items and gives error for the rest.

It is deleting all the items, after I run several times. 

I observe that it is always deleting 2 items for every run and throwing the error for the rest.

Snippet

$pnp.sp.web.lists.getByTitle('MyList').items.filter("AuthorId eq '" + _spPageContextInfo.userId + "'").get().then(function (docs) {
       for (var d = 0; d < docs.length; d++) {
           $pnp.sp.web.lists.getByTitle('Doc List').items.getById(docs[d].ID).delete();
       }