diff --git a/MatrixSDK/Background/MXBackgroundPushRulesManager.swift b/MatrixSDK/Background/MXBackgroundPushRulesManager.swift
index da793d2eef..8c3d3bffc0 100644
--- a/MatrixSDK/Background/MXBackgroundPushRulesManager.swift
+++ b/MatrixSDK/Background/MXBackgroundPushRulesManager.swift
@@ -42,7 +42,9 @@ import Foundation
                 }
             }
             
-            flatRules = tmpRules
+            // vector-im/element-ios/issues/7636
+            // Intentionally disable new backend push rules as they're not handle properly and break notification sounds
+            flatRules = tmpRules.filter { $0.ruleId != ".m.rule.is_user_mention" && $0.ruleId != ".m.rule.is_room_mention" }
         }
     }
     private var flatRules: [MXPushRule] = []
@@ -129,7 +131,9 @@ import Foundation
             var conditionsOk: Bool = true
             var runEquivalent: Bool = false
             
-            guard let kind = MXPushRuleKind(identifier: rule.kind) else { continue }
+            guard let kind = MXPushRuleKind(identifier: rule.kind) else {
+                continue
+            }
             
             switch kind {
             case .override, .underride:
diff --git a/MatrixSDK/Data/Store/MXFileStore/MXFileStore.m b/MatrixSDK/Data/Store/MXFileStore/MXFileStore.m
index e2bfc932f1..5207df6c6a 100644
--- a/MatrixSDK/Data/Store/MXFileStore/MXFileStore.m
+++ b/MatrixSDK/Data/Store/MXFileStore/MXFileStore.m
@@ -2209,7 +2209,23 @@ - (void)saveReceipts
 
                         // Store new data
                         [self checkFolderExistenceForRoom:roomId forBackup:NO];
-                        [NSKeyedArchiver archiveRootObject:receiptsStore toFile:file];
+                        
+                        NSError *error = nil;
+                        NSData *result = [NSKeyedArchiver archivedDataWithRootObject:receiptsStore requiringSecureCoding:false error:&error];
+                        
+                        if (error != nil)
+                        {
+                            MXLogErrorDetails(@"Failed archiving receipts store", error);
+                            continue;
+                        }
+                        
+                        [result writeToURL:[NSURL fileURLWithPath:file] options: NSDataWritingAtomic error: &error];
+                        
+                        if (error != nil)
+                        {
+                            MXLogErrorDetails(@"Failed writing receipts store to file", error);
+                            continue;
+                        }
                     }
                 }
             }
diff --git a/MatrixSDK/Space/MXSpace.swift b/MatrixSDK/Space/MXSpace.swift
index 6c1533c436..c60312cde9 100644
--- a/MatrixSDK/Space/MXSpace.swift
+++ b/MatrixSDK/Space/MXSpace.swift
@@ -346,7 +346,11 @@ public class MXSpace: NSObject {
     ///
     /// - Returns: the mimnimum power level required to add a room to this space
     public func minimumPowerLevelForAddingRoom(with powerLevels: MXRoomPowerLevels) -> Int {
-        return powerLevels.events["m.space.child"] as? Int ?? powerLevels.stateDefault
+        guard let events = powerLevels.events else {
+            return powerLevels.stateDefault
+        }
+        
+        return events["m.space.child"] as? Int ?? powerLevels.stateDefault
     }
     
     // MARK: - Private
diff --git a/changelog.d/1810.bugfix b/changelog.d/1810.bugfix
new file mode 100644
index 0000000000..a81a4fd724
--- /dev/null
+++ b/changelog.d/1810.bugfix
@@ -0,0 +1 @@
+Prevent keyed archiver encoding crashes when writing read receipts to the file store
\ No newline at end of file
diff --git a/changelog.d/7636.bugfix b/changelog.d/7636.bugfix
new file mode 100644
index 0000000000..b338f87889
--- /dev/null
+++ b/changelog.d/7636.bugfix
@@ -0,0 +1 @@
+Fix incoming push notifications not triggering sounds
\ No newline at end of file
diff --git a/changelog.d/pr-1809.bugfix b/changelog.d/pr-1809.bugfix
new file mode 100644
index 0000000000..2991fed95c
--- /dev/null
+++ b/changelog.d/pr-1809.bugfix
@@ -0,0 +1 @@
+Fixes power level events force unwrap crash
\ No newline at end of file