Q&A setup bug everytime

Hello Eveyone,

I created a huge dasboard for my company and i would like to finish with a tab "Q&A"
To make that i created the tab with the right visual and i setup it with the "field synonyms" part (as you can see on the screen),
i included some tables like FTS_Sale, some measures and some columns in the tables PRODUCT and PLATFORM and i uncheck all the others terms.
But when i saved my powerbi and reopen it the day after, all my setup is erase as you can see : 

It's very annoying because when my intern customers would like to ask a question like : "Show me the value generated by the customer X" my Q&A visual will not inderstand the words "value" "generated" "customer" because in my tables these words doesn't exist but with my previous setup everything works fine...

the problem is just the fact that powerbi erase all my Q&A setup and i don't understand why...

Is anyone have an idea about this issue ? 

Thanks a lot and have a great day all !