No matching Localization found for Url

Question

We are getting below error while deployment. Site goes down for 1-2 minutes and then automatically comes up. It usually happens when we do the deployment. Once we recycle app pool everything starts working fine. We are using DD4T 2.1.4 for DD4T.model, So 2.1 for DD4T and Web 8 for Tridion.

Nothing in Tridion API client logs and Discovery service logs, it seems like for 2-3 minutes we are losing connection to the Discovery service. please see below Exception:

2017-08-10 10:09:13.9939|ERROR|Global.Exception.Handling|System.Exception: No matching Localization found for URL 'http://www.xxx.xx/xxxx/' ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Tridion.ContentDelivery.DynamicContent.DynamicMappingsRetriever.GetPublicationMapping(String url)
   at SCA.Modules.Core.Resolvers.PublicationResolver.Resolve(Uri uri) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Resolver\PublicationResolver.cs:line 103
   --- End of inner exception stack trace ---
   at SCA.Modules.Core.Resolvers.PublicationResolver.Resolve(Uri uri) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Resolver\PublicationResolver.cs:line 122
   at SCA.Modules.Core.Resolvers.PublicationResolver.FindMapping() in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Resolver\PublicationResolver.cs:line 77
   at SCA.Modules.Core.Resolvers.PublicationResolver.GetBaseUri() in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Resolver\PublicationResolver.cs:line 58
   at SCA.Modules.Core.Providers.Content.DefaultContentProvider.GetPage(String url) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Providers\Content\DefaultContentProvider.cs:line 98
   at SCA.Modules.Core.Providers.Content.DefaultContentProvider.BuildViewModel(String url) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Providers\Content\DefaultContentProvider.cs:line 177
   at SCA.Modules.Core.Providers.Content.DefaultContentByUrlProvider.Retrieve(String urlOrTcmUri) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Providers\Content\DefaultContentByUrlProvider.cs:line 51
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at SCA.Modules.Core.Binders.TypedModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) in E:\LocalAgent5\work\eba82aa7dfd1d8ff\src\SCA.Modules.Core\Binders\TypedModelBinder.cs:line 82
   at System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor)
   at System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__19(AsyncCallback asyncCallback, Object asyncState)