brcmf_inetaddr_changed: fail to get arp ip table err:-23
After spending a lot of time researching how to solve my problem, I realized that the best solution was to change my wireless card with an Intel one.
This way not only I solved my wireless network problems but also my Bluetooth problems.
I know this answer was not what I was expecting, but if I knew it I would have spent the 20$ and 2 minutes to change it a long time ago.
So my advice to anyone that have problems with the wifi of Dell XPS 9550 is to change the wifi card (I used this one: Intel Wireless Dual Band AC 8260NGW 867Mbps WIFI Card Bluetooth 4.2 8265NGW).
I would like also to thank @chili555 for his time.