Ensure that provider disconnect clears all subscriptions (#5516)

* Ensure that provider disconnect clears all subscriptions

* Update CHANGELOG

CHANGELOG.md

@@ -1,5 +1,19 @@
 # CHANGELOG
 
+## master
+
+Contributed:
+
+- Expose per-endpoint stats for providers (Thanks to https://github.com/jeluard)
+- Adjust ink! primitive extraction for v4 (Thanks to https://github.com/statictype)
+
+Changes:
+
+- Ensure that provider disconnect clears all subscriptions
+- Adjust typegen to internally use `import()` (catering for ESM provided types)
+- Update to latest Polkadot, Kusama & Substrate metadata
+
+
 ## 9.14.2 Feb 19, 2023
 
 Changes:

packages/api/src/base/Init.ts

@@ -373,6 +373,8 @@ export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
   }
 
   private _subscribeHealth (): void {
+    this._unsubscribeHealth();
+
     // Only enable the health keepalive on WS, not needed on HTTP
     this.#healthTimer = this.hasSubscriptions
       ? setInterval((): void => {
@@ -428,7 +430,7 @@ export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
 
   #onProviderDisconnect (): void {
     this._isConnected.next(false);
-    this._unsubscribeHealth();
+    this._unsubscribe();
     this.emit('disconnected');
   }