diff --git a/backend/training.go b/backend/training.go
index d02681f..fe0c0cc 100644
--- a/backend/training.go
+++ b/backend/training.go
@@ -536,7 +536,7 @@ func trainingRunJob(root string, count int) {
 			detectorScript,
 			"--root", root,
 			"--base", "yolo11n.pt",
-			"--epochs", "80",
+			"--epochs", "20",
 			"--imgsz", "640",
 		)
 
diff --git a/frontend/src/components/ui/TrainingTab.tsx b/frontend/src/components/ui/TrainingTab.tsx
index dce45bf..b938820 100644
--- a/frontend/src/components/ui/TrainingTab.tsx
+++ b/frontend/src/components/ui/TrainingTab.tsx
@@ -213,6 +213,37 @@ function sortTrainingLabels(input: Partial<TrainingLabels> | null | undefined):
   }
 }
 
+function TrainingOverlay(props: { step: string; progress: number }) {
+  return (
+    <div className="absolute inset-0 z-20 flex flex-col items-center justify-center bg-black/45 text-center text-white backdrop-blur-[1px]">
+      <LoadingSpinner
+        size="lg"
+        className="text-white"
+        srLabel="Training läuft…"
+      />
+
+      <div className="mt-3 text-sm font-semibold">
+        Training läuft…
+      </div>
+
+      <div className="mt-1 max-w-[260px] px-4 text-xs text-white/80">
+        {props.step || 'Bitte warten. Die Oberfläche ist währenddessen gesperrt.'}
+      </div>
+
+      <div className="mt-3 h-2 w-48 overflow-hidden rounded-full bg-white/20">
+        <div
+          className="h-full rounded-full bg-emerald-400 transition-all duration-500"
+          style={{ width: `${clampPercent(props.progress)}%` }}
+        />
+      </div>
+
+      <div className="mt-1 text-[11px] text-white/70">
+        {Math.round(props.progress)}%
+      </div>
+    </div>
+  )
+}
+
 export default function TrainingTab() {
   const [labels, setLabels] = useState<TrainingLabels>(emptyLabels)
   const [sample, setSample] = useState<TrainingSample | null>(null)
@@ -353,12 +384,9 @@ export default function TrainingTab() {
 
       if (cancelled) return
 
-      const res = await fetch('/api/training/status', { cache: 'no-store' })
-      const data = await res.json().catch(() => null)
-
-      if (!cancelled && !data?.training?.running) {
-        await loadNext()
-      }
+      // Wichtig: Auch während laufendem Training wieder das aktuelle offene Sample laden,
+      // damit nicht "Kein Frame geladen" angezeigt wird.
+      await loadNext()
     }
 
     void init()
@@ -819,22 +847,6 @@ export default function TrainingTab() {
             {trainingRunning ? 'Training läuft…' : 'Training starten'}
           </Button>
 
-          {trainingRunning ? (
-            <div className="rounded-lg bg-gray-50 p-2 text-xs ring-1 ring-black/5 dark:bg-white/5 dark:ring-white/10">
-              <div className="flex items-center justify-between gap-2 text-[11px] text-gray-600 dark:text-gray-300">
-                <span>{shownTrainingStep || 'Training läuft…'}</span>
-                <span>{Math.round(shownTrainingProgress)}%</span>
-              </div>
-
-              <div className="mt-2 h-2 overflow-hidden rounded-full bg-gray-200 dark:bg-white/10">
-                <div
-                  className="h-full rounded-full bg-emerald-500 transition-all duration-500"
-                  style={{ width: `${clampPercent(shownTrainingProgress)}%` }}
-                />
-              </div>
-            </div>
-          ) : null}
-
           <div className="text-[11px] leading-relaxed text-gray-500 dark:text-gray-400">
             {canStartTraining ? (
               <>
@@ -865,14 +877,7 @@ export default function TrainingTab() {
       {/* Mitte */}
       <section className="min-w-0 rounded-xl border border-gray-200 bg-white p-3 shadow-sm dark:border-white/10 dark:bg-gray-900/60">
         <div className="relative flex min-h-[360px] flex-1 items-center justify-center overflow-hidden rounded-lg bg-black">
-          {loading ? (
-            <LoadingSpinner
-              size="lg"
-              center
-              className="text-white/80"
-              srLabel="Frame wird geladen…"
-            />
-          ) : imageSrc ? (
+          {imageSrc ? (
             <div className="relative flex h-full w-full items-center justify-center">
               <div
                 ref={imageBoxRef}
@@ -926,7 +931,7 @@ export default function TrainingTab() {
                               ? 'cursor-default bg-amber-400'
                               : 'cursor-pointer bg-emerald-400 hover:bg-red-400',
                           ].join(' ')}
-                          disabled={Boolean(isDraft)}
+                          disabled={Boolean(isDraft) || uiLocked}
                           title={isDraft ? box.label : `${box.label} löschen`}
                           onPointerDown={(e) => {
                             e.preventDefault()
@@ -935,7 +940,7 @@ export default function TrainingTab() {
                           onClick={(e) => {
                             e.preventDefault()
                             e.stopPropagation()
-                            if (!isDraft) removeBox(index)
+                            if (!isDraft && !uiLocked) removeBox(index)
                           }}
                         >
                           <span>{box.label}</span>
@@ -951,35 +956,26 @@ export default function TrainingTab() {
                   })}
                 </div>
               </div>
+
               {trainingRunning ? (
-                <div className="absolute inset-0 z-20 flex flex-col items-center justify-center bg-black/45 text-center text-white backdrop-blur-[1px]">
-                  <LoadingSpinner
-                    size="lg"
-                    className="text-white"
-                    srLabel="Training läuft…"
-                  />
-
-                  <div className="mt-3 text-sm font-semibold">
-                    Training läuft…
-                  </div>
-
-                  <div className="mt-1 max-w-[260px] px-4 text-xs text-white/80">
-                    {shownTrainingStep || 'Bitte warten. Die Oberfläche ist währenddessen gesperrt.'}
-                  </div>
-
-                  <div className="mt-3 h-2 w-48 overflow-hidden rounded-full bg-white/20">
-                    <div
-                      className="h-full rounded-full bg-emerald-400 transition-all duration-500"
-                      style={{ width: `${clampPercent(shownTrainingProgress)}%` }}
-                    />
-                  </div>
-
-                  <div className="mt-1 text-[11px] text-white/70">
-                    {Math.round(shownTrainingProgress)}%
-                  </div>
-                </div>
+                <TrainingOverlay
+                  step={shownTrainingStep}
+                  progress={shownTrainingProgress}
+                />
               ) : null}
             </div>
+          ) : trainingRunning ? (
+            <TrainingOverlay
+              step={shownTrainingStep || 'Aktuelles Bild wird geladen…'}
+              progress={shownTrainingProgress}
+            />
+          ) : loading ? (
+            <LoadingSpinner
+              size="lg"
+              center
+              className="text-white/80"
+              srLabel="Frame wird geladen…"
+            />
           ) : (
             <div className="text-sm text-white/80">Kein Frame geladen</div>
           )}