no instagram messages anymore ?

hello... i have no more access to my instagram messages... it's been 3 days.

did not change anything on my settings

i deleted the account, recreated it, still no change

on my inbox, when i select instagram : you have no messages

on my preferences, instagram account is activated, and i selected "all messages" in my inbox

when i select a contact instagram and try to write to him, the message is not sent "unknown error"

any ideas ? thank you !