diff --git a/custom_components/dkncloudna/__init__.py b/custom_components/dkncloudna/__init__.py
index 3db5fe9..db028d2 100644
--- a/custom_components/dkncloudna/__init__.py
+++ b/custom_components/dkncloudna/__init__.py
@@ -9,9 +9,18 @@ from homeassistant.exceptions import ConfigEntryAuthFailed
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 
 from .api import DknCloudNaClient
-from .const import CONF_REFRESH_TOKEN, CONF_USER_TOKEN, DOMAIN, LOGGER
+from .const import (
+    CONF_EXPOSE_PII,
+    CONF_REFRESH_TOKEN,
+    CONF_SCAN_INTERVAL,
+    CONF_USER_TOKEN,
+    DOMAIN,
+    LOGGER,
+)
 from .coordinator import DknCoordinator
 
+_RELOAD_KEYS = {CONF_SCAN_INTERVAL, CONF_EXPOSE_PII}
+
 PLATFORMS: list[Platform] = [
     Platform.CLIMATE,
     Platform.SENSOR,
@@ -44,6 +53,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     hass.data[DOMAIN][entry.entry_id] = {
         "coordinator": coordinator,
         "client": client,
+        "_prev_options": dict(entry.options),
     }
 
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
@@ -74,5 +84,9 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
 
 
 async def _async_reload_entry(hass: HomeAssistant, entry: ConfigEntry) -> None:
-    """Reload entry when options change."""
-    await hass.config_entries.async_reload(entry.entry_id)
+    """Reload entry when user-facing options change (not token refreshes)."""
+    domain_data = hass.data.get(DOMAIN, {}).get(entry.entry_id, {})
+    prev_opts = domain_data.get("_prev_options", {})
+    if any(entry.options.get(k) != prev_opts.get(k) for k in _RELOAD_KEYS):
+        await hass.config_entries.async_reload(entry.entry_id)
+    domain_data["_prev_options"] = dict(entry.options)
diff --git a/custom_components/dkncloudna/api.py b/custom_components/dkncloudna/api.py
index 10d60b9..a3b9b52 100644
--- a/custom_components/dkncloudna/api.py
+++ b/custom_components/dkncloudna/api.py
@@ -90,7 +90,7 @@ class DknCloudNaClient:
                 "GET",
                 API_IS_LOGGED_IN,
                 require_auth=True,
-                auth_error_statuses={401, 403},
+                auth_error_statuses={401, 403, 404},
             )
         except DknAuthError:
             return False
@@ -106,7 +106,7 @@ class DknCloudNaClient:
             "GET",
             API_REFRESH_TOKEN.format(refresh_token=self.refresh_token),
             require_auth=bool(self.token),
-            auth_error_statuses={400, 401, 403},
+            auth_error_statuses={400, 401, 403, 404},
         )
         self._store_tokens(data)
 
@@ -117,7 +117,7 @@ class DknCloudNaClient:
             API_INSTALLATIONS,
             require_auth=True,
             retry_on_auth=True,
-            auth_error_statuses={401, 403},
+            auth_error_statuses={401, 403, 404},
         )
         if not isinstance(data, list):
             raise DknConnectionError("Unexpected installations response")
@@ -397,10 +397,20 @@ class DknCloudNaClient:
         except ClientError as err:
             raise DknConnectionError(str(err) or type(err).__name__) from err
 
-        LOGGER.debug("DKN response %s %s status=%s", method, url, response.status)
+        if response.status >= 400:
+            LOGGER.warning(
+                "DKN API error %s %s status=%s body=%s",
+                method,
+                url,
+                response.status,
+                data if not isinstance(data, str) or len(data) < 200 else data[:200],
+            )
+        else:
+            LOGGER.debug("DKN response %s %s status=%s", method, url, response.status)
 
         if response.status in (auth_error_statuses or set()):
             if retry_on_auth and self.refresh_token:
+                LOGGER.info("DKN token expired, attempting refresh")
                 await self.refresh_access_token()
                 return await self._request(
                     method,
diff --git a/custom_components/dkncloudna/coordinator.py b/custom_components/dkncloudna/coordinator.py
index ef8a0db..f1afa6c 100644
--- a/custom_components/dkncloudna/coordinator.py
+++ b/custom_components/dkncloudna/coordinator.py
@@ -12,7 +12,7 @@ from homeassistant.exceptions import ConfigEntryAuthFailed
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 
 from .api import DknAuthError, DknCloudNaClient, DknConnectionError
-from .const import DEFAULT_SCAN_INTERVAL, DOMAIN, LOGGER
+from .const import CONF_REFRESH_TOKEN, CONF_USER_TOKEN, DEFAULT_SCAN_INTERVAL, DOMAIN, LOGGER
 
 
 class DknCoordinator(DataUpdateCoordinator[dict[str, dict[str, Any]]]):
@@ -64,6 +64,8 @@ class DknCoordinator(DataUpdateCoordinator[dict[str, dict[str, Any]]]):
         except Exception as err:  # noqa: BLE001
             raise UpdateFailed(f"Unexpected error: {type(err).__name__}") from err
 
+        self._persist_tokens_if_changed()
+
         devices: dict[str, dict[str, Any]] = {}
         existing = self.data or {}
         for installation in installations or []:
@@ -80,6 +82,25 @@ class DknCoordinator(DataUpdateCoordinator[dict[str, dict[str, Any]]]):
 
         return devices
 
+    def _persist_tokens_if_changed(self) -> None:
+        """Save refreshed tokens back to the config entry so they survive restarts."""
+        opts = self._entry.options
+        stored_token = opts.get(CONF_USER_TOKEN)
+        stored_refresh = opts.get(CONF_REFRESH_TOKEN)
+        if (
+            self.client.token
+            and self.client.refresh_token
+            and (
+                self.client.token != stored_token
+                or self.client.refresh_token != stored_refresh
+            )
+        ):
+            new_opts = dict(opts)
+            new_opts[CONF_USER_TOKEN] = self.client.token
+            new_opts[CONF_REFRESH_TOKEN] = self.client.refresh_token
+            self.hass.config_entries.async_update_entry(self._entry, options=new_opts)
+            LOGGER.debug("DKN tokens persisted after refresh")
+
     async def async_handle_socket_device_data(
         self, mac: str, data: dict[str, Any]
     ) -> None: