diff --git a/mipi_test_interactive.py b/mipi_test_interactive.py
index 6030fc2..7902535 100644
--- a/mipi_test_interactive.py
+++ b/mipi_test_interactive.py
@@ -494,6 +494,12 @@ def _set_timebase(scale, points):
 
 
 def _arm_and_wait(timeout=20):
+    """Single acquisition via :DIGitize + *OPC?.
+    :DIGitize holds the SCPI bus until it triggers — if it times out we close
+    and reopen the VXI-11 link to abort the pending RPC so subsequent writes
+    to a fresh connection succeed.  :SINGle + status polling is NOT used: on
+    this scope it generates QUERY UNTERMINATED errors that break later acquires."""
+    global scope
     prev_timeout = scope.timeout
     try:
         scope.timeout = timeout + 5
@@ -501,9 +507,27 @@ def _arm_and_wait(timeout=20):
         return scope.ask("*OPC?").strip() == "1"
     except Exception as e:
         print(f"  ACQUIRE ERROR: {e}")
+        try:
+            scope.close()
+        except Exception:
+            pass
+        time.sleep(2.0)
+        for attempt in range(3):
+            try:
+                scope = vxi11.Instrument(SCOPE_IP)
+                scope.timeout = 30
+                scope.write(":STOP")
+                time.sleep(0.2)
+                break
+            except Exception as re:
+                print(f"  SCOPE RECONNECT ERROR (attempt {attempt+1}): {re}")
+                time.sleep(1.0)
         return False
     finally:
-        scope.timeout = prev_timeout
+        try:
+            scope.timeout = prev_timeout
+        except Exception:
+            pass
 
 
 def _save_pass(tag, iteration, ts):
@@ -596,7 +620,7 @@ def _arm_scope_for_clk_startup() -> None:
     print("  CLK STARTUP: scope armed on CLK+ falling edge.")
 
 
-def _collect_clk_startup(ts: str, iteration: int, timeout: float = 10.0) -> list[str]:
+def _collect_clk_startup(ts: str, iteration: int, timeout: float = 3.0) -> list[str]:
     """
     Poll for CLK startup trigger, save, transfer, and analyse the capture.
     Returns LP summary strings (empty list if trigger timed out).
@@ -617,6 +641,11 @@ def _collect_clk_startup(ts: str, iteration: int, timeout: float = 10.0) -> list
 
     if not triggered:
         print("  CLK STARTUP: trigger timeout — CLK may already be in continuous HS.")
+        try:
+            scope.write(":STOP")   # abort the pending :SINGle before reconfiguring
+            time.sleep(0.2)
+        except Exception:
+            pass
         _restore_hs_config()
         return []
 
@@ -700,6 +729,10 @@ def dual_capture(iteration: int) -> str:
         else:
             print("  RIGOL CH2: IRQ read failed.")
     _restore_hs_config()
+    try:
+        requests.put(URL, json={"state": "on"}, timeout=1)
+    except Exception:
+        pass
 
     # ── Pass 2: HS signal quality ──────────────────────────────────────────
     print("  PASS 2: SIGNAL QUALITY...")
@@ -708,6 +741,10 @@ def dual_capture(iteration: int) -> str:
         _save_pass("sig", iteration, ts)
     else:
         print("  SKIPPING SIG SAVE.")
+    try:
+        requests.put(URL, json={"state": "on"}, timeout=1)
+    except Exception:
+        pass
 
     # ── Pass 3: frame/protocol structure ──────────────────────────────────
     print("  PASS 3: FRAME STRUCTURE...")
@@ -721,8 +758,11 @@ def dual_capture(iteration: int) -> str:
     _fetch_registers(ts, iteration)
 
     # ── Restore default timebase ──────────────────────────────────────────
-    _set_timebase(5e-9, 500_000)
-    scope.write(":RUN")
+    try:
+        _set_timebase(5e-9, 500_000)
+        scope.write(":RUN")
+    except Exception as e:
+        print(f"  WARNING: scope restore failed: {e}")
     return ts
 
 
@@ -1281,6 +1321,14 @@ def run_interactive_test() -> None:
     # ── Pixel clock configuration ──────────────────────────────────────────
     config = prompt_for_config()
 
+    # Flush any stale SCPI state from previous runs (QUERY UNTERMINATED errors etc.)
+    try:
+        scope.write("*CLS")
+        scope.write(":STOP")
+        time.sleep(0.3)
+    except Exception as e:
+        print(f"  WARNING: scope pre-flush failed: {e}")
+
     print("\nINTERACTIVE FLICKER TEST STARTED.")
     print("Each iteration: display ON → 3-pass capture → LP analysis → Claude check.")
     print("The display stays ON while Claude and the operator assess the frame.")