diff --git a/firmware/main/net.c b/firmware/main/net.c
index 7070da6..e9a8db2 100644
--- a/firmware/main/net.c
+++ b/firmware/main/net.c
@@ -83,6 +83,8 @@ static void wifi_event(void *arg, esp_event_base_t base, int32_t id, void *data)
     } else if (base == IP_EVENT && id == IP_EVENT_STA_GOT_IP) {
         ip_event_got_ip_t *ev = (ip_event_got_ip_t *)data;
         s_got_ip = true;
+        /* always-powered appliance: modem sleep wedges the hosted SDIO link */
+        esp_wifi_set_ps(WIFI_PS_NONE);
         ESP_LOGI(TAG, "got ip " IPSTR, IP2STR(&ev->ip_info.ip));
         setenv("TZ", "CET-1CEST,M3.5.0,M10.5.0/3", 1);
         tzset();
diff --git a/firmware/sdkconfig.defaults b/firmware/sdkconfig.defaults
index 91f9d33..cd4da0d 100644
--- a/firmware/sdkconfig.defaults
+++ b/firmware/sdkconfig.defaults
@@ -51,7 +51,7 @@ CONFIG_ESP_HOSTED_DFLT_TASK_FROM_SPIRAM=n
 # hosted 2.x: keep internal RAM for task stacks; buffers go to PSRAM
 CONFIG_ESP_HOSTED_MEMPOOL_PREFER_SPIRAM=y
 # conservative SDIO clock for first data-path proof (raise after verification)
-CONFIG_ESP_HOSTED_SDIO_CLOCK_FREQ_KHZ=20000
+CONFIG_ESP_HOSTED_SDIO_CLOCK_FREQ_KHZ=10000
 
 # headroom for diag event handlers that touch LVGL
 CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE=4096