Update fixing-common-issues.mdx

Add details to on 429: Too many request error

Author: fpagny

ai-data/generative-apis/troubleshooting/fixing-common-issues.mdx

@@ -13,11 +13,24 @@ dates:
 
 Below are common issues that you may encounter when using Generative APIs, their causes, and recommended solutions.
 
-## 504: Timeout
+## 429: Too Many Request - You exceeded your current quota of requests/tokens per minute
 
 ### Cause
-- The query is too long.
-- The model goes into an infinite loop while processing the input.
+- You performed too many API requests over a given minute
+- You consumed too much tokens (input and output) with your API requests over a given minute 
+
+### Solution
+- [Ask our support](https://console.scaleway.com/support/tickets/create) to raise your quota
+- Smooth out your API requests rate by limiting the number of API requests you perform in parallel
+- Reduce the size of the input or output tokens processed by your API requests
+- Use [Managed Inference](/ai-data/managed-inference/), where these quota do not apply (your throughput will be only limited by the amount of Inference Deployment your provision)
+
+
+## 504: Gateway Timeout
+
+### Cause
+- The query is too long to process (even if context-length stays [between supported context window and maximum tokens](https://www.scaleway.com/en/docs/ai-data/generative-apis/reference-content/supported-models/))
+- The model goes into an infinite loop while processing the input (which is a known structural issue with several AI models)
 
 ### Solution
 - Set a stricter **maximum token limit** to prevent overly long responses.