diff --git a/src/app/api/ai/analyze/route.ts b/src/app/api/ai/analyze/route.ts
index d379861..89fc4af 100644
--- a/src/app/api/ai/analyze/route.ts
+++ b/src/app/api/ai/analyze/route.ts
@@ -37,7 +37,15 @@ export async function POST(req: NextRequest) {
             console.warn(`[AI] Timeout for product analysis — OpenRouter too slow.`);
             return NextResponse.json({ error: "timeout", retryAfter: 5 }, { status: 504 });
         }
+
         const msg = err instanceof Error ? err.message : "Unknown error";
+
+        // Propager l'état de surcharge Open Router (502 Gateway, 503 Unavailable, 529 Overloaded)
+        if (msg.includes("502") || msg.includes("503") || msg.includes("529") || msg.includes("Bad Gateway") || msg.includes("overloaded")) {
+            console.warn(`[AI] External API overload detected: ${msg}`);
+            return NextResponse.json({ error: "gateway_timeout", detail: msg }, { status: 502 });
+        }
+
         return NextResponse.json({ error: msg }, { status: 500 });
     }
 }
diff --git a/src/features/ai-copilot/components/ai-insight-block.tsx b/src/features/ai-copilot/components/ai-insight-block.tsx
index 40a262a..2b00270 100644
--- a/src/features/ai-copilot/components/ai-insight-block.tsx
+++ b/src/features/ai-copilot/components/ai-insight-block.tsx
@@ -145,7 +145,10 @@ export function AiInsightBlock({ row }: AiInsightBlockProps) {
 
     if (status === "error") {
         return (
-            <div className="flex items-center gap-1.5 text-[11px] text-rose-600 dark:text-rose-500">
+            <div
+                className="flex items-center gap-1.5 text-[11px] text-rose-600 dark:text-rose-500 cursor-help"
+                title={insight?.insight || "Une erreur inconnue est survenue"}
+            >
                 <AlertCircle className="w-3 h-3" />
                 <span>Erreur</span>
             </div>
diff --git a/src/features/grid/components/bulk-ai-analyzer.tsx b/src/features/grid/components/bulk-ai-analyzer.tsx
index 769ca8c..296d8ad 100644
--- a/src/features/grid/components/bulk-ai-analyzer.tsx
+++ b/src/features/grid/components/bulk-ai-analyzer.tsx
@@ -227,12 +227,12 @@ export function BulkAiAnalyzer() {
                                     const wait = (retryData.retryAfter ?? 30) * 1000;
                                     console.warn(`[BulkAI] Rate limited, retry in ${wait / 1000}s`);
                                     await new Promise((r) => setTimeout(r, Math.min(wait, 15_000)));
-                                } else if (res.status === 504) {
-                                    // Timeout serveur : retry rapide (le modèle était peut-être surchargé)
-                                    console.warn(`[BulkAI] Timeout (504) for ${payload.codein}, retry #${attempt + 1}`);
-                                    await new Promise((r) => setTimeout(r, 2_000));
+                                } else if (res.status === 504 || res.status === 502 || res.status === 503 || res.status === 529) {
+                                    // Timeout ou réseau surchargé : on tente de réessayer de suite
+                                    console.warn(`[BulkAI] Network issue (${res.status}) for ${payload.codein}, retry #${attempt + 1}`);
+                                    await new Promise((r) => setTimeout(r, 2_000 * (attempt + 1))); // Exponential backoff (2s, 4s, 6s)
                                 } else {
-                                    // Autre erreur (500, etc.) : ne pas réessayer inutilement
+                                    // Autre erreur (500 local, auth, etc.) : ne pas réessayer inutilement
                                     break;
                                 }
                             } catch (fetchErr) {
@@ -242,7 +242,18 @@ export function BulkAiAnalyzer() {
                         }
 
                         if (!res || !res.ok) {
-                            setError(payload.codein, res?.status === 504 ? "Timeout IA" : "Erreur API");
+                            let errorMsg = res?.status === 504 ? "Timeout IA" : (res?.status === 502 ? "API Surchargée" : `Erreur HTTP ${res?.status}`);
+
+                            // On tente d'extraire le message original s'il y en a un
+                            if (res && res.headers.get("content-type")?.includes("application/json")) {
+                                try {
+                                    const errData = await res.json();
+                                    if (errData.error) errorMsg += ` - ${errData.error}`;
+                                    if (errData.detail) errorMsg += ` (${errData.detail})`;
+                                } catch (e) { /* ignore JSON parse error on error */ }
+                            }
+
+                            setError(payload.codein, errorMsg);
                             errorsCount++;
                         } else {
                             const data = await res.json();