OutOfMemory Exception

Hi,

we are getting outOfMemory exception after 700-800 request executes successfully.

Error stack : System.OutOfMemoryException:
at System.Threading.Thread.StartInternal (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
at System.Threading.Thread.Start (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
at System.Reactive.Concurrency.EventLoopScheduler.EnsureThread (System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263)
at System.Reactive.Concurrency.EventLoopScheduler.Schedule (System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263)
at System.Reactive.Concurrency.LocalScheduler.Schedule (System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263)
at System.Reactive.Concurrency.Scheduler.Schedule (System.Reactive, Version=4.3.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263)
at GraphQL.Client.Http.Websocket.GraphQLHttpWebSocket..ctor (GraphQL.Client, Version=3.0.3.0, Culture=neutral, PublicKeyToken=null)
at GraphQL.Client.Http.GraphQLHttpClient..ctor (GraphQL.Client, Version=3.0.3.0, Culture=neutral, PublicKeyToken=null)
at GraphQL.Client.Http.GraphQLHttpClient..ctor (GraphQL.Client, Version=3.0.3.0, Culture=neutral, PublicKeyToken=null)
at SmartX.Bot.Services.BaseApiClient..ctor (SmartX.Bot.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
at SmartX.Bot.Services.OotfExperiences.OotfExperienceApiClient..ctor (SmartX.Bot.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
at CalendarSkill.Services.OotfXAPI.OotfxCalendarApi.InitOotfExperienceApiClient (CalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=nullCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\calendarskill-JCI\calendarskill\Services\OotfXAPI\OotfxCalendarAPI.csCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: 455)
at CalendarSkill.Services.ServiceManager.InitCalendarService (CalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=nullCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\calendarskill-JCI\calendarskill\Services\ServiceManager.csCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: 47)
at CalendarSkill.Dialogs.CalendarSkillDialogBase+d__38.MoveNext (CalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=nullCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\calendarskill-JCI\calendarskill\Dialogs\CalendarSkillDialogBase.csCalendarSkill, Version=1.0.34.0, Culture=neutral, PublicKeyToken=null: 353)

Code:

public readonly GraphQLHttpClient ApiClient;

public BaseApiClient(Connection connection, OAuthDetails oAuthDetails)
{
this._apiConnection = connection ?? throw new ArgumentNullException(nameof(connection));
this._oAuthDetails = oAuthDetails ?? throw new ArgumentNullException(nameof(oAuthDetails));
if (connection.EndPointUri == null) throw new ArgumentNullException(nameof(connection.EndPointUri));
this.ApiClient = new GraphQLHttpClient(connection.EndPointUri, new NewtonsoftJsonSerializer());
this.ApiClient.HttpClient.DefaultRequestHeaders.Clear();
this.AddTokenToRequestHeaders();
if (connection.CollectionId.HasValue())
{
this.ApiClient.HttpClient.DefaultRequestHeaders.Add("collectionId", connection.CollectionId);
}
}

This is how we are disposing objects:
this.ApiClient.HttpClient.Dispose();
this.ApiClient.Dispose();

can someone help us in fixing the issue?