Make sure your battery is fully charged.

Also try each channel separately as I indicated above.

Sometimes WiFi signals will also swamp the RX and cause what you are seeing.

I have several WiFi routers in my house and I often have to remember that with 72mHz I can see strange results because of this.

You may want to take the plane out to an area away from any WIFi and hook everything up.

Then do a range test with the plane on the ground.

Don't be tempted to fly it until everything looks good.

You can easily replace a bad receiver, etc... but as often said, planes don't fix themselves in the air!