Microsoft 365 Copilot giving error output when asking to compare files

 Hello
 Please i need your help on this issue.
 

Microsoft 365 Copilot giving error output when asking to compare files. We have been using both the copilot web application and copilot within teams to create prompts and agents.
 

Over the last 4 weeks we have been facing a lot more problems with it then before. Copilot is very inconsistent with its answers (seemingly more than before).
 

At first, I thought it had to do with the prompt and possible new guidelines, but it seems like the problem also occurs for very basic commands.
 This happens when we use both GPT4 and GPT5. As an example, when trying to compare two Excel files with each other.
 

We ask it to find the invoice numbers, and output which invoice numbers match and which ones are not present in the other file (filtered for the correct date and entity).
 

These files both only have one sheet and are not complex. I, very often, get this as the response: "Sorry, I wasn't able to respond to that.
 

Is there something else I can help with?" This is after it provides the whole output, and then at the last moment, it collapses the output and only provides this as an output.

 When other people run this prompt, they encounter the same problem. I would say this happens around 30% of the time when using copilot. Also, when using the suggested prompts/responses.