EmberData RESTAdapter, regular refresh on one page with url filter

I have a Host model that is, for the moment, pretty simple:

App.Host = DS.Model.extend
  name: DS.attr 'string'

The data adapter is handle by ember-data, my route looks like this:

App.HostsRoute = Ember.Route.extend
  init: ->
    @_super()
    @refresh()

  model: ->
    @store.find 'host',
      problematic: 1

  refresh: ->
    setTimeout =>
      @store.find('host', { problematic: 1 }).then (hosts) =>
        @controller.set 'content', hosts
      @refresh()
    , 10000

My template will show a list of boxes to list and manage nagios alerts:

<h2>Hosts list</h2>

<div class="row">
    <div class="col-md-8">
        {{#each host in controller}}
            <div class="box box-solid box-default collapsed-box">
                <div class="box-header">
                    <h5 class="box-title">
                        <i class="fa fa-server"></i>
                        {{ host.name }}
                    </h5>
                    <div class="box-tools pull-right">
                        <button class="btn btn-default btn-sm" data-widget="collapse"><i class="fa fa-plus"></i></button>
                    </div>
                </div>
                <div class="box-body no-padding table-responsive" style="display: none">
                    {{#link-to 'host' host}}{{host.name}}{{/link-to}}
                    <table class="table table-hover">
                        <colgroup>
                            <col/>
                            <col style="width: 100%"/>
                            <col/>
                            <col/>
                        </colgroup>
                        <thead>
                        <tr>
                            <th>Service</th>
                            <th>Message</th>
                            <th>State</th>
                            <th>Actions</th>
                        </tr>
                        </thead>
                        <tbody>
                        </tbody>
                    </table>
                </div>
            </div>

        {{/each}}
    </div>

    <div class="col-md-4">
        {{outlet}}
    </div>
</div>

My boxes are collapsed by default and can be uncollapsed by a js trick.

In each refresh, boxes are again collapsed. In fact, all the html is rewritten.

If I try without the problematic: 1 query parameter (calls /hosts instead of /hosts?problematic=1) it's works like a charm without rewriting all the html. The boxes stay uncollapsed.

So the problem source seems to be the additional query param but I don't know why.

What is wrong? How can I solve it?

Thanks.