Error after application is idle for a long time

After my program is running for about 20 minutes the application crashes with the following error:

System.Exception: Access token corrupted

at RingCentral.Subscription.SubscriptionServiceImplementation.Renew()

at RingCentral.Subscription.SubscriptionServiceImplementation.OnTimedExpired(Object source)

at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.TimerQueueTimer.CallCallback()

at System.Threading.TimerQueueTimer.Fire()

at System.Threading.TimerQueue.FireNextTimers()

This is my code:

Dim subscription = New SubscriptionServiceImplementation With {._platform = ringCentral}

subscription.AddEvent("/restapi/v1.0/account/~/extension/~/presence?detailedTelephonyState=true")

Dim responsePub = subscription.Subscribe(AddressOf ActionOnUser, AddressOf ActionOnConnect, AddressOf ActionOnError)