diff --git a/frontend/src/app/admin/scanner/_lib/feedback.ts b/frontend/src/app/admin/scanner/_lib/feedback.ts
index 694cec7..1c975b3 100644
--- a/frontend/src/app/admin/scanner/_lib/feedback.ts
+++ b/frontend/src/app/admin/scanner/_lib/feedback.ts
@@ -1,3 +1,5 @@
+import toast from 'react-hot-toast';
+
 // Haptic + audio confirmation. At a loud, dark door the sound and the buzz are
 // what staff actually register — the green flash is confirmation for the person
 // standing in front of them.
@@ -39,3 +41,18 @@ export function vibrate(pattern: number | number[]) {
     if (navigator.vibrate) navigator.vibrate(pattern);
   } catch {}
 }
+
+/**
+ * Dismiss a toast after `ms` regardless of react-hot-toast's hover/touch pause.
+ *
+ * The <Toaster> pauses every countdown while the pointer is "inside" its
+ * container, and schedules no dismissal at all for toasts created while paused.
+ * On a touchscreen, tapping a toast button (the Undo toast) synthesizes a
+ * mouseenter with no mouseleave until the next tap somewhere else — so the
+ * "Undone" toast that follows would sit there indefinitely. Callers create the
+ * toast with `duration: Infinity` and let this timer close it.
+ */
+export function dismissAfter(id: string, ms: number): string {
+  window.setTimeout(() => toast.dismiss(id), ms);
+  return id;
+}
diff --git a/frontend/src/app/admin/scanner/page.tsx b/frontend/src/app/admin/scanner/page.tsx
index f4e8c37..29c057d 100644
--- a/frontend/src/app/admin/scanner/page.tsx
+++ b/frontend/src/app/admin/scanner/page.tsx
@@ -26,7 +26,7 @@ import { formatCurrency, parseDate, EVENT_TIMEZONE } from '@/lib/utils';
 
 import { buildIndex, searchAttendees, hasExactMatch } from './_lib/search';
 import { newIdempotencyKey, submitDoorAction, undoDoorAction } from './_lib/doorActions';
-import { playSuccessSound, playErrorSound, vibrate } from './_lib/feedback';
+import { playSuccessSound, playErrorSound, vibrate, dismissAfter } from './_lib/feedback';
 import { QRScannerOverlay } from './_components/QRScannerOverlay';
 import { AttendeeRow } from './_components/AttendeeRow';
 import { WalkInRow, emptyWalkIn, type WalkInDraft } from './_components/WalkInRow';
@@ -48,6 +48,10 @@ import { ResultScreen, type DoorResult } from './_components/ResultScreen';
 const REFRESH_INTERVAL_MS = 30_000;
 const FLASH_MS = 900;
 const UNDO_WINDOW_MS = 10_000;
+// Every toast on this screen is closed by our own timer (dismissAfter) rather
+// than react-hot-toast's countdown, which pauses while a toast is touched and
+// never resumes on a touchscreen until the next tap elsewhere.
+const TOAST_MS = 4000;
 
 const clockTime = (value: Date | string) =>
   (typeof value === 'string' ? parseDate(value) : value).toLocaleTimeString([], {
@@ -250,12 +254,18 @@ export default function AdminDoorPage() {
 
       try {
         await undoDoorAction(eventId, entry.idempotencyKey);
-        toast.success(`Undone — ${entry.name}`, { position: 'bottom-center' });
+        dismissAfter(
+          toast.success(`Undone — ${entry.name}`, { position: 'bottom-center', duration: Infinity }),
+          TOAST_MS,
+        );
       } catch (error: any) {
-        toast.error(`Could not undo ${entry.name}: ${error?.message || 'request failed'}`, {
-          position: 'bottom-center',
-          duration: 8000,
-        });
+        dismissAfter(
+          toast.error(`Could not undo ${entry.name}: ${error?.message || 'request failed'}`, {
+            position: 'bottom-center',
+            duration: Infinity,
+          }),
+          8000,
+        );
       } finally {
         // Whatever happened, the server is the truth about who is inside.
         loadAttendees(eventId, { silent: true });
@@ -293,8 +303,9 @@ export default function AdminDoorPage() {
             </button>
           </div>
         ),
-        { duration: durationMs, position: 'bottom-center' },
+        { duration: Infinity, position: 'bottom-center' },
       );
+      dismissAfter(id, durationMs);
       undoToastIdsRef.current.set(entry.idempotencyKey, id);
     },
     [handleUndo],
@@ -430,7 +441,10 @@ export default function AdminDoorPage() {
         );
         if (res.warnings?.includes('at_capacity') && !capacityWarnedRef.current) {
           capacityWarnedRef.current = true;
-          toast('Event at capacity, added anyway', { icon: '⚠️', position: 'bottom-center', duration: 6000 });
+          dismissAfter(
+            toast('Event at capacity, added anyway', { icon: '⚠️', position: 'bottom-center', duration: Infinity }),
+            6000,
+          );
         }
       } catch (error: any) {
         // Retries are exhausted: make the failure loud and name the person, so
@@ -457,10 +471,13 @@ export default function AdminDoorPage() {
             detail: error?.message || 'The check-in did not reach the server. Try again.',
           });
         }
-        toast.error(`FAILED — ${opts.displayName} is NOT checked in. ${error?.message || ''}`.trim(), {
-          duration: 12000,
-          position: 'bottom-center',
-        });
+        dismissAfter(
+          toast.error(`FAILED — ${opts.displayName} is NOT checked in. ${error?.message || ''}`.trim(), {
+            duration: Infinity,
+            position: 'bottom-center',
+          }),
+          12000,
+        );
         loadAttendees(eventId, { silent: true });
       } finally {
         setBusyId((current) => (current === opts.busyKey ? null : current));