Wifi problem Note 8

I have Note 8, bought it last week. And now i am facing this problem....Every time I connect my device to a wifi the wifi stops working for me and all other users connected to the same router. Sometimes it connects normally then a few seconds later it stops working... I have tried all the following:

1- Reset network settings.
2- Reset all settings.
3- Factory reset.
4- wipe cache partition.

I have also contacted Samsung, and they asked me to send the device to Qatar knowing that I live in Jordan. just because I bought it from Qatar.

why don't they fix it in their company in Jordan? why should I send it to another country while they are the same company.

Anyone can help fix the issue? or help me to deliver my problem to Samsung?