typescript - DOM memory leak with angular 2 -

my company building large scale application , have created large 5000+ line component. said, we've came across place in application has memory leak. feel adding thousands of controls dom.
have narrowed down we're pushing objects array, , when garbage collector cleans don't thing removing of nodes dom. of said have hit brick wall in trying clean appreciated. have created plnkr similar we're doing , have reproduced memory leak on smaller scale our application. can please tell me why happening , how fix it?

the code @ is:

.html

<div> <div class="col-sm-1 left-column">   <div> </div>   <div *ngfor="let line of lines">{{line.linename}}</div> </div> <div class="col-sm-11">   <div *ngfor="let column of columns" class="col-sm-1">     <span class=column-header>{{column?.title}}</span>     <div *ngfor="let line of column?.linemodels"></div>   </div> </div> 

.ts

export class examplecomponent implements oninit, ondestroy {    constructor(private exampleservice:exampleservice){   }    private lines:linemodel[]=[];   private columns:columnmodel[]=[];    ngoninit(){     this.lines = this.exampleservice.getlines();     this.columns = this.exampleservice.getcolumns();   }    ngondestroy(){     //i have tried lines.removeat(line.lineindex) doesnt remove dom.   }  } 

chrome snap shot

going out second time