diff --git a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataBuildManager.java b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataBuildManager.java
index 2c0a1a63..ebff6913 100644
--- a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataBuildManager.java
+++ b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataBuildManager.java
@@ -75,12 +75,8 @@ public class ArbitraryDataBuildManager extends Thread {
         if (now == null) {
             return;
         }
-        synchronized (arbitraryDataBuildQueue) {
-            arbitraryDataBuildQueue.entrySet().removeIf(entry -> entry.getValue().hasReachedBuildTimeout(now));
-        }
-        synchronized (arbitraryDataFailedBuilds) {
-            arbitraryDataFailedBuilds.entrySet().removeIf(entry -> entry.getValue().hasReachedFailureTimeout(now));
-        }
+        arbitraryDataBuildQueue.entrySet().removeIf(entry -> entry.getValue().hasReachedBuildTimeout(now));
+        arbitraryDataFailedBuilds.entrySet().removeIf(entry -> entry.getValue().hasReachedFailureTimeout(now));
     }
 
     // Build queue
diff --git a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileListManager.java b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileListManager.java
index bdec61b2..e855171d 100644
--- a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileListManager.java
+++ b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileListManager.java
@@ -84,9 +84,7 @@ public class ArbitraryDataFileListManager {
             return;
         }
         final long requestMinimumTimestamp = now - ArbitraryDataManager.ARBITRARY_REQUEST_TIMEOUT;
-        synchronized (arbitraryDataFileListRequests) {
-            arbitraryDataFileListRequests.entrySet().removeIf(entry -> entry.getValue().getC() == null || entry.getValue().getC() < requestMinimumTimestamp);
-        }
+        arbitraryDataFileListRequests.entrySet().removeIf(entry -> entry.getValue().getC() == null || entry.getValue().getC() < requestMinimumTimestamp);
     }
 
 
diff --git a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java
index b6559abd..a529282c 100644
--- a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java
+++ b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java
@@ -101,22 +101,14 @@ public class ArbitraryDataFileManager extends Thread {
             return;
         }
         final long requestMinimumTimestamp = now - ArbitraryDataManager.getInstance().ARBITRARY_REQUEST_TIMEOUT;
-        synchronized (arbitraryDataFileRequests) {
-            arbitraryDataFileRequests.entrySet().removeIf(entry -> entry.getValue() == null || entry.getValue() < requestMinimumTimestamp);
-        }
+        arbitraryDataFileRequests.entrySet().removeIf(entry -> entry.getValue() == null || entry.getValue() < requestMinimumTimestamp);
 
         final long relayMinimumTimestamp = now - ArbitraryDataManager.getInstance().ARBITRARY_RELAY_TIMEOUT;
-        synchronized (arbitraryRelayMap) {
-            arbitraryRelayMap.removeIf(entry -> entry == null || entry.getTimestamp() == null || entry.getTimestamp() < relayMinimumTimestamp);
-        }
-        synchronized (arbitraryDataFileHashResponses) {
-            arbitraryDataFileHashResponses.removeIf(entry -> entry.getTimestamp() < relayMinimumTimestamp);
-        }
+        arbitraryRelayMap.removeIf(entry -> entry == null || entry.getTimestamp() == null || entry.getTimestamp() < relayMinimumTimestamp);
+        arbitraryDataFileHashResponses.removeIf(entry -> entry.getTimestamp() < relayMinimumTimestamp);
 
         final long directConnectionInfoMinimumTimestamp = now - ArbitraryDataManager.getInstance().ARBITRARY_DIRECT_CONNECTION_INFO_TIMEOUT;
-        synchronized (directConnectionInfo) {
-            directConnectionInfo.removeIf(entry -> entry.getTimestamp() < directConnectionInfoMinimumTimestamp);
-        }
+        directConnectionInfo.removeIf(entry -> entry.getTimestamp() < directConnectionInfoMinimumTimestamp);
     }
 
 
@@ -492,9 +484,7 @@ public class ArbitraryDataFileManager extends Thread {
     }
 
     private void removeFromRelayMap(ArbitraryRelayInfo entry) {
-        synchronized (arbitraryRelayMap) {
-            arbitraryRelayMap.removeIf(relayInfo -> relayInfo.equals(entry));
-        }
+        arbitraryRelayMap.removeIf(relayInfo -> relayInfo.equals(entry));
     }
 
 
diff --git a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataRenderManager.java b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataRenderManager.java
index c1693118..2844cef8 100644
--- a/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataRenderManager.java
+++ b/src/main/java/org/qortal/controller/arbitrary/ArbitraryDataRenderManager.java
@@ -56,9 +56,7 @@ public class ArbitraryDataRenderManager extends Thread {
             return;
         }
         final long minimumTimestamp = now - AUTHORIZATION_TIMEOUT;
-        synchronized (this.authorizedResources) {
-            this.authorizedResources.entrySet().removeIf(entry -> entry.getValue() == null || entry.getValue() < minimumTimestamp);
-        }
+        this.authorizedResources.entrySet().removeIf(entry -> entry.getValue() == null || entry.getValue() < minimumTimestamp);
     }
 
     public boolean isAuthorized(ArbitraryDataResource resource) {
diff --git a/src/main/java/org/qortal/controller/arbitrary/ArbitraryMetadataManager.java b/src/main/java/org/qortal/controller/arbitrary/ArbitraryMetadataManager.java
index 892529fa..fb75ea05 100644
--- a/src/main/java/org/qortal/controller/arbitrary/ArbitraryMetadataManager.java
+++ b/src/main/java/org/qortal/controller/arbitrary/ArbitraryMetadataManager.java
@@ -73,9 +73,7 @@ public class ArbitraryMetadataManager {
             return;
         }
         final long requestMinimumTimestamp = now - ArbitraryDataManager.ARBITRARY_REQUEST_TIMEOUT;
-        synchronized (arbitraryMetadataRequests) {
-            arbitraryMetadataRequests.entrySet().removeIf(entry -> entry.getValue().getC() == null || entry.getValue().getC() < requestMinimumTimestamp);
-        }
+        arbitraryMetadataRequests.entrySet().removeIf(entry -> entry.getValue().getC() == null || entry.getValue().getC() < requestMinimumTimestamp);
     }