[Neonghost21]

I have been using a microsoft wireless adapter to wirelessly mirror to my tv from my galaxy 7 plus. I just received the new galaxy 9 and can't stay connected to it. I do not and have not had home wifi. The s9 will mirror the screen for a couple seconds then disconnects.

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What does the "Microsoft Wireless Adapter" do? Our Samsung Galaxy Note's mirror directly to our Samsung Smart TVs.

[SpywareDr]

What does the "Microsoft Wireless Adapter" do? Our Samsung Galaxy Note's mirror directly to our Samsung Smart TVs.

[Neonghost21]

My tv is not a smart tv so the adapter allows it to miracast to the tv.

[SpywareDr]

Oh, cool.

Just found this on Microsoft.com: Microsoft Wireless Display Adapter

 

The Wireless Display Adapter uses
Wi-Fi
CERTIFIED™ Miracast® technology, so you’re not limited to certain apps or content streaming; you can display everything from your device on an HDTV or monitor.

Just plug the USB and HDMI from the Wireless Display Adapter into your HDTV or monitor, connect, then mirror or extend your screen and enjoy. The Wireless Display Adapter delivers a reliable connection with ...
up to a 23-foot range.

 

So getting back to your problem, couple of questions:

• Are you within 23-feet of the adapter?
• Is there anything else around that might be causing Wi-Fi interference in the 2.4 GHz band?
  For example, microwave ovens, security cameras, ZigBee devices, video senders, cordless phones, baby monitors, etc., all of which can cause significant Wi-Fi interference. It is also an issue when municipalities or other large entities (such as universities) seek to provide large area Wi-Fi coverage. Even bad electrical connections can cause broad RF spectrum emissions which will interfere with Wi-Fi.