diff --git a/lib/backend/dynamo/shards.go b/lib/backend/dynamo/shards.go
index 741501101971e..15dd4445b73d8 100644
--- a/lib/backend/dynamo/shards.go
+++ b/lib/backend/dynamo/shards.go
@@ -152,8 +152,8 @@ func (b *Backend) pollStreams(externalCtx context.Context) error {
 	b.buf.SetInit()
 	defer b.buf.Reset()
 
-	ticker := time.NewTicker(b.PollStreamPeriod)
-	defer ticker.Stop()
+	timer := time.NewTimer(b.PollStreamPeriod)
+	defer timer.Stop()
 
 	for {
 		select {
@@ -174,10 +174,11 @@ func (b *Backend) pollStreams(externalCtx context.Context) error {
 			} else {
 				b.buf.Emit(event.events...)
 			}
-		case <-ticker.C:
+		case <-timer.C:
 			if err := refreshShards(false); err != nil {
 				return trace.Wrap(err)
 			}
+			timer.Reset(b.PollStreamPeriod)
 		case <-ctx.Done():
 			b.logger.Log(ctx, logutils.TraceLevel, "Context is closing, returning.")
 			return nil
@@ -281,6 +282,12 @@ func (b *Backend) collectActiveShards(ctx context.Context, streamArn *string) ([
 			return filterActiveShards(out), nil
 		}
 		input.ExclusiveStartShardId = streamInfo.StreamDescription.LastEvaluatedShardId
+		select {
+		case <-ctx.Done():
+			// let the next call deal with the context error
+		case <-time.After(200 * time.Millisecond):
+			// 10 calls per second with two auths, with ample margin
+		}
 	}
 }