Sitecore XC error Commerce.Connector - Release mapping lock

 Recently, We have updated the configuration of commerce authoring and got very strange errors as below

 1508 12:44:10 ERROR Commerce.Connector - Request URL: GetCatalogMappings(environmentName='') - Exception: System.AggregateException: One or more errors occurred. ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.  
   --- End of inner exception stack trace ---  
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)  
   at Sitecore.Commerce.Engine.Connect.DataProvider.CommerceRepository.InvokeHttpClientGet(String serviceCallUrl, Boolean useCommerceOps, Boolean raiseException, String language, String environment, IDictionary`2 headers)  
 ---> (Inner Exception #0) System.Threading.Tasks.TaskCanceledException: A task was canceled.<---  
 Exception: System.AggregateException  
 Message: One or more errors occurred.  
 Source: mscorlib  
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)  
   at Sitecore.Commerce.Engine.Connect.DataProvider.CommerceRepository.InvokeHttpClientGet(String serviceCallUrl, Boolean useCommerceOps, Boolean raiseException, String language, String environment, IDictionary`2 headers)  
 Nested Exception  
 Exception: System.Threading.Tasks.TaskCanceledException  
 Message: A task was canceled.  
 1508 12:44:10 INFO Commerce.Connector - Release mapping lock  
 1508 12:44:10 INFO Commerce.Connector - Acquiring mapping lock  
 1508 12:44:10 INFO Commerce.Connector - Mapping locked  
 1508 12:47:40 ERROR Commerce.Connector - Request URL: GetCatalogMappings(environmentName='') - Exception: System.AggregateException: One or more errors occurred. ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.  
   --- End of inner exception stack trace ---  
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)  
   at Sitecore.Commerce.Engine.Connect.DataProvider.CommerceRepository.InvokeHttpClientGet(String serviceCallUrl, Boolean useCommerceOps, Boolean raiseException, String language, String environment, IDictionary`2 headers)  
 ---> (Inner Exception #0) System.Threading.Tasks.TaskCanceledException: A task was canceled.<---  
 Exception: System.AggregateException  
 Message: One or more errors occurred.  
 Source: mscorlib  
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)  
   at Sitecore.Commerce.Engine.Connect.DataProvider.CommerceRepository.InvokeHttpClientGet(String serviceCallUrl, Boolean useCommerceOps, Boolean raiseException, String language, String environment, IDictionary`2 headers)  
 Nested Exception  
 Exception: System.Threading.Tasks.TaskCanceledException  
 Message: A task was canceled.  

We didn't find the root caue but a full redployment and restart of the IIS had resovled that issue