diff --git a/web/app.js b/web/app.js
index 8f0e99d..5be4743 100644
--- a/web/app.js
+++ b/web/app.js
@@ -15,7 +15,31 @@ const config = { sensitivity:600, deadZone:0.06, accelStrength:0.08, curve:0, ax
 let device=null, server=null, chars={}, userDisconnected=false;
 let currentChargeStatus=0, currentBattPct=null;
 
+// ── GATT write queue (prevents "operation already in progress") ───────────────
+let _gattQueue = Promise.resolve();
+function gattWrite(char, value) {
+  const p = _gattQueue.then(() => char.writeValueWithResponse(value));
+  _gattQueue = p.catch(() => {});
+  return p;
+}
+function gattCmd(char, value) {
+  const p = _gattQueue.then(() => char.writeValueWithoutResponse(value));
+  _gattQueue = p.catch(() => {});
+  return p;
+}
+
 // ── Logging ──────────────────────────────────────────────────────────────────
+(function() {
+  const _methods = { log: '', warn: 'warn', error: 'err' };
+  for (const [method, type] of Object.entries(_methods)) {
+    const orig = console[method].bind(console);
+    console[method] = (...args) => {
+      orig(...args);
+      log(args.map(a => typeof a === 'object' ? JSON.stringify(a) : String(a)).join(' '), type);
+    };
+  }
+})();
+
 function log(msg, type='') {
   const el=document.getElementById('console');
   const now=new Date();
@@ -153,7 +177,12 @@ function applyConfigToUI() {
   document.getElementById('tapModGui').checked   = !!(config.tapMod & 0x08);
 }
 
-async function writeConfigBlob() {
+let _writeConfigTimer = null;
+function writeConfigBlob() {
+  clearTimeout(_writeConfigTimer);
+  _writeConfigTimer = setTimeout(_doWriteConfigBlob, 150);
+}
+async function _doWriteConfigBlob() {
   if (!chars.configBlob) return;
 
   // Gather current UI values into the config shadow
@@ -184,7 +213,7 @@ async function writeConfigBlob() {
   view.setUint8(19, 0);
 
   try {
-    await chars.configBlob.writeValueWithResponse(buf);
+    await gattWrite(chars.configBlob, buf);
     log(`Config written — sens=${config.sensitivity.toFixed(0)} tapThr=${config.tapThreshold} tapAction=${config.tapAction}`,'ok');
   } catch(e) { log(`Config write failed: ${e.message}`,'err'); }
 }
@@ -192,10 +221,10 @@ async function writeConfigBlob() {
 // ── Individual control handlers ───────────────────────────────────────────────
 // These update the local config shadow then write the full blob
 
-async function setCurve(val) {
+function setCurve(val) {
   config.curve = val;
   setCurveUI(val);
-  await writeConfigBlob();
+  writeConfigBlob();
   log(`Curve → ${['LINEAR','SQUARE','SQRT'][val]}`,'ok');
 }
 function setCurveUI(val) {
@@ -203,10 +232,10 @@ function setCurveUI(val) {
     document.getElementById(id).classList.toggle('active', i===val));
 }
 
-async function setChargeMode(val) {
+function setChargeMode(val) {
   config.chargeMode = val;
   setChargeModeUI(val);
-  await writeConfigBlob();
+  writeConfigBlob();
   log(`Charge → ${['OFF','SLOW 50mA','FAST 100mA'][val]}`,'warn');
 }
 function setChargeModeUI(val) {
@@ -218,10 +247,10 @@ function setChargeModeUI(val) {
   document.getElementById('ciMode').textContent = ['Off (0mA)','50 mA','100 mA'][val] ?? '--';
 }
 
-async function setTapAction(val) {
+function setTapAction(val) {
   config.tapAction = val;
   setTapActionUI(val);
-  await writeConfigBlob();
+  writeConfigBlob();
 }
 function setTapActionUI(val) {
   ['tapActLeft','tapActRight','tapActMiddle','tapActKey'].forEach((id,i) =>
@@ -237,7 +266,7 @@ function onTapKeyInput() {
 
 async function sendCalibrate() {
   if (!chars.command) return;
-  try { await chars.command.writeValueWithoutResponse(new Uint8Array([0x01])); log('Calibration sent — hold still!','warn'); }
+  try { await gattCmd(chars.command, new Uint8Array([0x01])); log('Calibration sent — hold still!','warn'); }
   catch(e) { log(`Calibrate failed: ${e.message}`,'err'); }
 }
 function confirmReset() { document.getElementById('overlay').classList.add('show'); }
@@ -245,7 +274,7 @@ function closeModal()   { document.getElementById('overlay').classList.remove('s
 async function doReset() {
   closeModal(); if (!chars.command) return;
   try {
-    await chars.command.writeValueWithoutResponse(new Uint8Array([0xFF]));
+    await gattCmd(chars.command, new Uint8Array([0xFF]));
     log('Factory reset sent…','warn');
     setTimeout(async () => { await readConfigBlob(); log('Config reloaded','ok'); }, 1500);
   } catch(e) { log(`Reset failed: ${e.message}`,'err'); }