diff --git a/ROADMAP.md b/ROADMAP.md
index e03ce9f..2d75f96 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -99,3 +99,4 @@
 | v1.8.22 | 2026-05-06 | Fix: Stromtarif-Einstellungen bleiben nach Neustart erhalten; Finanzen-Tab Layout |
 | v1.8.23 | 2026-05-07 | Fix: Goodwe Netzbezug-Periode zeigt 0 kWh — integrierter grid_power-Zähler statt e_total_imp-Delta |
 | v1.8.24 | 2026-05-07 | Fix: WR/Wallbox-Offline-Flapping — erst nach 3 aufeinanderfolgenden Lesefehlern offline schalten |
+| v1.8.25 | 2026-05-07 | Fix: TCP-Timeout auf max. 40% des Poll-Intervalls begrenzt (Wallbox + Modbus) — verhindert Poll-Überlappung |
diff --git a/haos-addon/config.yaml b/haos-addon/config.yaml
index 088f9bc..f3e9cd4 100644
--- a/haos-addon/config.yaml
+++ b/haos-addon/config.yaml
@@ -1,5 +1,5 @@
 name: ShineBridge
-version: "1.8.24"
+version: "1.8.25"
 slug: shinebridge
 description: Growatt Wechselrichter lokal in Home Assistant — Modbus TCP via ShineLAN-X, MQTT Discovery, Web UI
 url: https://gitea.bitfire.work/retr0/shinebridge
diff --git a/haos-addon/src/main.py b/haos-addon/src/main.py
index 55a2dbc..28264b7 100644
--- a/haos-addon/src/main.py
+++ b/haos-addon/src/main.py
@@ -280,7 +280,7 @@ def _poll_loop(inv_cfg: Dict[str, Any], stop: threading.Event):
         log.info("[%s] Poll-Loop: %s @ %s (Goodwe UDP/8899) alle %ds",
                  inv_id, inverter.name, host, interval)
     elif inverter.protocol == "kathrein":
-        reader = WallboxReader(host=host, port=port)
+        reader = WallboxReader(host=host, port=port, timeout=min(5.0, interval * 0.4))
         ems = EmsController(
             min_pv_power=inv_cfg.get("ems_min_pv", 1400),
             pv_timeout_h=inv_cfg.get("ems_timeout", 4.0),
@@ -290,7 +290,7 @@ def _poll_loop(inv_cfg: Dict[str, Any], stop: threading.Event):
         log.info("[%s] Poll-Loop: %s @ %s:%s (Kathrein EMS) alle %ds",
                  inv_id, inverter.name, host, port, interval)
     else:
-        reader = ModbusReader(host=host, port=port, slave=slave)
+        reader = ModbusReader(host=host, port=port, slave=slave, timeout=min(5.0, interval * 0.4))
         log.info("[%s] Poll-Loop: %s @ %s:%s alle %ds",
                  inv_id, inverter.name, host, port, interval)